Angela Merkel's open door policy to refugees is no longer welcomed in Germany following four savage Muslim attacks in a week.

Attitudes to Syrians seeking asylum has hardened after ISIS suicide bomber Mohammad Daleel blew himself up outside a wine bar in the quiet in the quiet Barvarian market town of Ansbach.

Other violence over the space of four days in the last week has left Germans feeling vulnerable and afraid. A new survey found that 83 per cent of Germans see immigration as their nation's biggest challenge - twice as many as a year ago.

More than 200,000 failed asylum seekers like Daleel remain in the country - and many Germans blame Merkel for inviting more than a million refugees into the country in the past year without adequate background checks.

The mood sweeping Germany was summed up by mother of two Anna Lissner who said she now feared for her children's safety.

Fears: The week of violence on the streets of Germany has led the country to have second thoughts about Angela Mrkel's 'open door' policy on migrants. Student Sophia Stigler, 21, said she had friends who were harassed by refugees and since the violence she is not feeling as warm hearted to the new arrivals

Concern: Anna Lisser added: 'The suicide bombing has proved we don't know who we have invited in. It was right to accept refugees but we now realise we do not know where they are from and what they will do.'

'The suicide bombing has proved we do not know who we have invited in.' said the 47-year-old who lives in the town of Ingolstadt, which is located on the River Danube, southern Germany.

'We have to be humanitarian and it was right to accept refugees but we now realise we do not know where they are from and what they will do.

'More checks should have been made before anyone was allowed to settle.'

A bloody week of violence that rocked Germany began on July 18th when Pakistani teenager Riaz Khan Ahmadzai, 17, posing as an Afghan refugee, hacked at passengers on a train in Wurzburg with an axe, wounding five. He was shot dead by police.

Four days later mentally unstable German-Iranian teenager Ali Sonboly shot nine people dead during a rampage through a shopping centre in Munich before taking his own life.

Sonboly claimed he was taking revenge for being bullied at school with no political motive to the murderous rampage.

Two days later a Syrian refugee, 21, hacked a pregnant woman to death in Reutlingen and on the same night Daleel, 27, injured 12 people when he detonated a rucksack packed with metal shards and screws.

Daleel carried out the attack on behalf of the terror group ISIS and had planned to kill hundreds by detonating him bomb at an open-air music festival.

He was only thwarted after being turned away by security guard Pascal Bohm and instead detonated his rucksack bomb outside a wine bar.

And today it emerged a gang of six men stormed a swimming pool stormed into a German swimming pool yelling 'Allahu Akbar'.

The gang, in their twenties, spat at women and children because they were swimming in the nude and called all the females 'sluts' in the town of Geldern in the North Rhine-Westphalia region.

Evil: ISIS jihadi Mohammad Daleel, a failed Syrian asylum seeker, blew himself up outside a wine bar in Ansbach after he was turned away from a music festival for not having a ticket

Video: Daleel, who injured 12 people in the attack, appeared in a chilling video pledging his allegiance to ISIS. His claim for asylum was rejected and he was one of 200,000 in the country awaiting deportation

Concert: Daleel, 27, would have possibly killed hundreds of people had he got into the music festival in Ansbach, southern Germany. Just 30 minutes later he detonated his rucksack packed with metal shards

Carnage: Daleel was turned away from the concert by security guard Philip Bohm, 25, who said the terrorist was staring at him nervously. His blast has heightened fears in Germany over border controls

Search: Police raided the asylum centre in Ansbach where Daleel had been staying as he awaited deportation back to Bulgaria - the first safe country he arrived in from Syria

Barvaria: The explosion took place in the city of Ansbach, 50 miles west of Nurenburg, in southern Germany

Fears were first raised about the influx of refugees at the start of the year when hundreds of women were sexually assaulted by 'mobs of foreign men' in the city of Cologne during New Year celebrations.

The culmination of the this week's bloodshed has led to calls from politicians for Merkel to take back control of its border - and cut immigration.

Sahra Wagenknecht, leader of the far-left Linke party, said the German Chancellor's statement 'wir schaffen das' (we can manage) when she opened the country's doors to those fleeing war zones had been found wanting.

Wagenknecht said the 'intake and integration of a large number of refugees and immigrants is accompanied by considerable problems.'

And even one of Merkel's deputies admitted Germany cannot control the number of migrants crossing their borders insisting the country needs its sovereignty back.

Stephan Mayer called immigration a 'big challenge' for law enforcement, and said the government were not able to register and control.

'We have to regain sovereignty and we have to regain the rule of rights. There's a lot of space for improvement,' he said.

'We were not able to register and control all the migrants that crossed the German border.'

MailOnline visited a major city, town and small country village to gauge the mood among the people after the most terror attacks.

In Nuremberg, one of the oldest cities in Germany, women interviewed said they were now afraid for their safety.

'It is terrible what has happened and after the suicide bombing by a Syrian refugee I think those here now should be checked,' said 26-year-old Lina Kielaite.

'I think it is going to be a big problem. I was for the refugees being allowed into Germany as I am originally from Liuthiania, but we have to know where they have come from and if they are here because they want to be.'

Anger: The week of bloodshed has fuelled concerns the government there isn't doing enough to integrate refugees. In Nuremburg, Isabel Bleicher said: 'They do not see any hope and that is why they turn to groups like ISIS. More has to be done to help them otherwise there are going to be more attacks.'

Nuremburg: Scene of the WWII Nazi war trials, the city has one of Germany's largest universities with young people supporting Merkel's decision to allow one million refugees into the country. But there remain concerns

Businessman Oliver Schollmayer, 37, who declined to be photographed, said he was disgusted by Merkel's open door policy and said it should be changed.

'We were told they were fleeing war, but its now apparent most are here for economic reason,' he said.

'That was not why we opened out borders. I think the problem will spiral out of control.'

Eric Bohunsky, who operated a cycle taxi service for tourists, said uncontrolled immigration into Germany was creating problems.

He said he admired Britain for voting for Brexit and securing control of their borders.

'The British people have done well to stand up to Brussels and those who dictate who can come into their country,' said the 50-year-old.

'We are heading for problems here, but I just hope there are no further attacks.

'The problem is not knowing who we have let in and what they might do.'

Nuremberg, the site of Nazi party rallies and the scene for the war trials at the end of the Second World War, has a 500,000 population with over a third made up of immigrants.

It is the the closest city to Ansbach where Daleel died on Sunday night in his failed bid to kill revellers at the open-air concert.

Famed for its Christmas market which attracts over one million visitors a year the city is estimated to have taken in thousands refugees.

It is also home to one of Germany's largest universities with University of Erlangen-Nuremberg where almost 40,000 students study.

Young people in Germany are more likely to have to supported Merkel's decision to allow one million refugees into the country.

Hitting back: In Kipfenberg, unlike the major cities its population has not been swelled by asylum seekers with the 1,700 residents more likely to see tourists walking the streets. But the people here have witnessed the terror attacks around them and have blamed Merkel for failing to do proper checks on new arrivals

Sceptical: Philippe Fochs, 31, a teacher, said he had supported the decision to throw open Germany's doors to those in need. But he added: 'It would be wrong to say all the Syrian refugees are terrorists because they are not, but it is fair to say we do not know who they are.'

Uined: Dominic Bauer was emphatic that no more refugees should be allowed in. He said: 'It has to stop and stop now. I never agreed with Merkel's decision to let in a million and we are seeing the problems it will cause.'

But many now said her Government had not done enough to help the refugees settle into a new country and blamed the lack of help for the current violence.

'I think a lot of the people coming here are having a terrible time and that is the fault of the Government,' said 21-year-old student Isabel Bleichner.

'They do not see any hope and that is why they turn to groups like ISIS. More has to be done to help them otherwise there are going to be more attacks.

'What has taken place over the last week has left me scared. I want to feel I can walk the street safely and not worry about being blown up.'

A 40 minute drive away though the lush Bavarian countryside is the small town of Kipfenberg, a popular destination with tourists who visit the hillside castle and fortress.

Axe attack: The bloody week of violence in Germany began with Pakistani teenager Riaz Khan Ahmadzai, 17, posing as an Afghan refugee slashing passengers on a train in Wurzburg, wounding five

Carnage: Gruesome pictures taken in the hours after the attack showed the blood-soaked interior of the train. Ahmadzai, who appeared in a chilling ISIS video, was shot dead by police

Paryy boy: ISIS fanatic Ahmadzai had been living with foster parents for two weeks before going on an axe rampage on the train. On his Facebook page he was pictured wearing a pink wig at a music festival

Unlike the major cities its population has not been swelled by asylum seekers with the 1,700 residents more likely to see tourists walking the streets.

Dominic Bauer, who works in a family run café in the centre of town, was emphatic that no more refugees should be allowed in.

'It has to stop and stop now,' said the 29 year old. 'I never agreed with Merkel's decision to let in one million and we are now seeing the problems it will cause.'

'I don’t like what Mrs Merkel has done to the country... it is ruining Germany.'

It has to stop and stop now. I never agreed with Merkel's decision to let in one million and we are no seeing the problems it will cause. Dominic Bauer, 29

Philippe Fochs, 31, a teacher, said he had supported the decision to throw open Germany's doors to those in need.

But like many said he was concerned that no checks had been made on those entering the country.

'It would be wrong to say all the Syrian refugees are terrorists because they are not, but it is fair to say we do not know who they are,' said Mr Fochs.

'Without question it was right to let them in, but more needs to be done to get information on them. I am surprised that didn't happen as we Germans are very good at filling out forms.'

Last year Ingolstadt made headlines when 'Amadeus' nightclub banned refugees after several women complained they were assaulted.

The town council introduced mentors who would help the men understand the etiquette and how to behave towards women while at the club.

Policy: One of Merkel's deputies has admitted Germany cannot control the number of migrants crossing their borders insisting the country needs its sovereignty back

Attack: One of Merkel's deputies Stephan Mayer (pictured) said the 1.1million migrants Germany let in last year represent a 'big challenge' for law enforcement

The incident caused outrage as refugee activists said it violated Germany's Law for Equal Treatment that prohibits discrimination based on race, ethnicity, gender, religion or sexual orientation.

The town, which has a population of 127,000 people, was one of the first stop for migrants flooding into Germany via countries like Hungary.

There are an estimated 4,000 asylum seekers in the town that sits on the River Danube.

Student Sophia Stigler, 21, said she had friends who were harassed by refugees and since the bombing and other violence was not feeling as warm hearted to the new arrivals.

'It does scare me that this can happen and as a country we have to look at why,' she said.

'We have had problems with refugees and it is right that Angela Merkel reviews her policy of letting more into the country.'

Her friend Taffy Geiss, a sales assistant, added: 'I am Merkel's biggest fan, but I think most people in Germany will now say enough is enough.'

Complaints: Last year Ingolstadt made headlines when 'Amadeus' nightclub banned refugees after women complained of being sexually assaulted. Mentors helped men understand how to behave towards women

Groping: Sophia Stigler said her friends were harassed by refugees. She added: 'It does scare me that this can happen and as a country we have to look at why.' Pictured: 'Amadeus' nightclub where women have complained of being groped. None of the women in this picture have complained

Enough: Taffy Geiss, a sales assistant from Ingolstadt, said: 'I am Merkel's biggest fan, but I think most people in Germany will now say enough is enough.'

Anne Lissner, who has sons aged 18 and 19, said she is now fearful when they attend music festivals after the failed suicide bombing.

'As a mother I am now scared for the safety of my children. It is summer and they want to go to festivals and travel on the train.