Armed police have raided a mosque in Berlin where a bombing attack was allegedly being planned.

Two suspected Islamists accused of belonging to an unidentified extremist group were arrested in Britz as part of the operation today.

A spokesperson for Berlin police said special forces stormed the Seituna Mosque in Charlottenburg, an affluent western district in the German capital, at 3pm local time.

No explosives have yet been found but searches with sniffer dogs continued, the Berliner Zeitung reported.

A car thought to be associated with the arrested men, aged 28 and 46, has also been cordoned off after a suspicious object was found, with police evacuating homes within a 300m safety cordon.

In September, Berlin police raided eight buildings following an investigation into Islamist extremists. Police said at the time that there was no evidence that suspects had been involved in planning attacks in Germany.

Today’s raid came as authorities lowered the terror alert level in Brussels after five days of “lockdown”.

The world mourns Paris attacks - in pictures Show all 25 1 /25 The world mourns Paris attacks - in pictures The world mourns Paris attacks - in pictures The world mourns Paris attacks Members of the public gather to lay flowers and light candles at La Belle Equipe restaraunt on Rue de Charonne in Paris Getty The world mourns Paris attacks - in pictures The world mourns Paris attacks People lay a memorial to honour victims of the Paris terror attacks at Federation Square in Melbourne, Australia The world mourns Paris attacks - in pictures The world mourns Paris attacks Soccer fans display the colors of the French flag in response to the deadly terrorist attack in Paris, France before the soccer match between the New York Cosmos' and the Ottawa Fury for the North American Soccer League championship at Hofstra University in Hempstead, New York, USA The world mourns Paris attacks - in pictures The world mourns Paris attacks Pakistani Civil society activists shout slogans during a protest against Isis militants near the French consulate for the victims of the 13 November Paris attacks in Karachi, Pakistan The world mourns Paris attacks - in pictures The world mourns Paris attacks People gather and view messages written on the ground at Place de la Republique in Paris The world mourns Paris attacks - in pictures The world mourns Paris attacks French flags and a note reading "We will not let you spoil our children's lives" at the site of the attack at the Cafe Belle Equipe on rue de Charonne in the 11th district, in Paris The world mourns Paris attacks - in pictures The world mourns Paris attacks A rose is placed beside a bullet hole at La Belle Equipe restaraunt on Rue de Charonne following the terrorist attack in Paris. As France observes three days of national mourning members of the public continue to pay tribute to the victims of deadly attacks The world mourns Paris attacks - in pictures The world mourns Paris attacks The world mourns Paris attacks - in pictures The world mourns Paris attacks Bono and band members of U2 pay their respects and place flowers on the pavement near the scene of yesterday's Bataclan Theatre terrorist attack in Paris The world mourns Paris attacks - in pictures The world mourns Paris attacks A man kneels as he pays tribute to victims at Place de la Republique near the deadly attack sites in Paris The world mourns Paris attacks - in pictures The world mourns Paris attacks Tributes to the victims at the Place de la Republique square in Paris AFP The world mourns Paris attacks - in pictures The world mourns Paris attacks An electronic billboard on a canal show solidarity with Paris in Milan EPA The world mourns Paris attacks - in pictures The world mourns Paris attacks People lay down flowers and light candles to tribute victims of Friday's attacks in Paris as the Brandenburg gate is illuminated in blue, white and red in the colors of the French flag, in Berlin Reuters The world mourns Paris attacks - in pictures The world mourns Paris attacks A man leaves flowers as a tribute following the deadly attacks in Paris, outside the French consulate in Istanbul Reuters The world mourns Paris attacks - in pictures The world mourns Paris attacks People take pictures of flowers placed in bullet holes in the window of a Japanese restaurant next to the cafe 'La Belle Equipe' AFP The world mourns Paris attacks - in pictures The world mourns Paris attacks People gather at a makeshift memorial next to the Bataclan theatre in Paris on November 14, 2015, The world mourns Paris attacks - in pictures The world mourns Paris attacks A woman carrying flowers cries in front of the Carillon cafe and the Petit Cambodge restaurant in Paris AP The world mourns Paris attacks - in pictures The world mourns Paris attacks People gather in front of flowers that were laid outside the French embassy in Rome AP The world mourns Paris attacks - in pictures The world mourns Paris attacks People react near the cafe 'La Belle Equipe' at the Rue de Charonne AFP The world mourns Paris attacks - in pictures The world mourns Paris attacks A young girl places a candle in front of the Carillon cafe in Paris AP The world mourns Paris attacks - in pictures The world mourns Paris attacks Flowers placed outside the cafe 'La Belle Equipe' at the Rue de Charonne in Paris, the scene for one of the attacks AFP The world mourns Paris attacks - in pictures The world mourns Paris attacks A woman is comforted by others outside the Carillon cafe and the Petit Cambodge restaurant in Paris The world mourns Paris attacks - in pictures The world mourns Paris attacks The Brandenbourg Gate featuring French national colors is pictured in Berlin, on November 14, 2015 a day after deadly attacks in Paris The world mourns Paris attacks - in pictures The world mourns Paris attacks Flowers are laid in front of the French embassy in Rome EPA The world mourns Paris attacks - in pictures The world mourns Paris attacks A candle is lit next to flowers outside the French Embassy in Berlin AFP

Schools, municipal buildings, some public transport and tourist attractions were closed from Saturday in the Belgian capital because of intelligence indicating a “serious and imminent” threat.

Peter Mertens, of the Belgian crisis centre, said the whole country is now on the second-highest level of alert.

Police have been carrying waves of raids in the city, aiming to find Paris attacks suspect Salah Abdeslam and arrest Islamists accused of planning further atrocities.

But the fugitive has not been found and 15 of the 16 detainees arrested on Sunday had to be released the following day.