No members of the family have been charged and some who were arrested on Sunday night by the FBI were quickly released

Rahami's wife is being questioned in the United Arab Emirates and his mother is thought to be in Turkey

The scorch marks left behind by the devices are revealed

The video was taken at the home in Elizabeth, New Jersey, by a family member, and was disclosed amid questions over what they knew

Federal charging documents reveal that Ahmad Rahami was captured on video letting off 'incendiary' device in his family's back yard

'Bomber': This is Ahmad Rahami, accused of the New York and New Jersey bombings and arrested on Monday, two days after the attacks

These are the burn marks left in his family home's back yard which the FBI believe are evidence of the chicken shop bomber practicing his attack - and being videoed doing it by a family member.

In exclusive DailyMail.com photos, large burned patches of grass can be seen in the backyard behind the fried chicken shop in Elizabeth, New Jersey.

According to the FBI's criminal complaint against Rahami, investigators found video on a family member's phone, filmed on September 15, which shows an explosion being set off in the back yard.

According to the court documents, the video 'depicts Rahimi igniting incendiary material in a cylindrical container'.

The pressure cooker and pipe bombs alleged to have been used in the New York and New Jersey attacks were said in the criminal complaint to have been made by Rahami using components he ordered online.

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Scorched: The burn damage to the lawn in the family's back garden is clearly visible from a neighboring property

Burned: The damage to the grass is believed to have been caused by a 'practice' run by Rahami, according to the FBI - and it was videoed by a family member

More damage: The obvious burn mark on one side of the garden may not be the only one - there is also apparent damage to the grass on the other side

FBI allegation: How the federal agency described the alleged practice run in court documents filed early on Wednesday

Footage shows him igniting incendiary material in a cylinder and a fuse being lit followed by loud explosion and billowing smoke, as laughter is heard in the background, court papers say.

The family member who filmed the video i s not named in the criminal complaint.

Neighbors and local business owners told Daily Mail.com that they had not heard an explosion last Thursday and were shocked to learn of it.

The extent of the damage to the backyard and the disclosure by the FBI that it relied on cellphone footage taken by another family member will only fuel questions over exactly what the alleged bomber's family knew about his plans.

Rahami has been charged with federal counts of using a weapon of mass destruction and bombing public places.

The 28-year-old had already been charged with five counts of attempted murder of a law enforcement officer and two gun charges after a shootout with police following the terror attacks over the weekend. He remains on $5.2million bail in hospital.

Now criminal complaint in Manhattan federal court provides clues to the chilling motivations that authorities say drove the Afghan-born U.S. citizen to set off explosives in New York and New Jersey, injuring at least 30 people.

Rahami could face multiple life sentences over the attacks.

The federal criminal complaint, filed in the Southern District of New York, alleges that Rahami began buying bomb components in June, purchasing citric acid, circuit boards, ball bearings and electric igniters on eBay.

In a statement, the online auction site said it was 'proactively working with law enforcement authorities on their investigation' but that all the items he's bought are widely available and 'legal to buy and sell in the United States'.

And a journal revealed he hoped to die a martyr and pledged that his 'bombs will be heard in the streets', authorities say.

'Death To Your OPPRESSION,' Ahmad Khan Rahami ranted about the US government in his diary, found by on the suspect by arresting officers.

The journal also praises Osama bin Laden and other terrorist figures, and accuses America of 'slaughter' in the Middle East.

The document also shows excerpts from a handwritten journal found on Rahami following his arrest Monday which gave some clue to the bomber's motives.

In it, he vowed to martyr himself rather than be caught after setting off explosives in New York and New Jersey, while it a ccuses the U.S. government of 'slaught(er) against the mujahidean (sic) be it Afghanistan, Iraq, Sham [Syria], Palestine ...'

Being questioned: Asia Bibi Rahim, the Pakistan-born wife of the alleged bomber, is being held in the United Arab Emirates

Father: Mohammad Rahami was seen outside the family home on Tuesday. The FBI alleged that the family's back yard was used two days before the bombings to

Family affair: One of Ahmad Rahami's younger brothers was seen in a store near the family home, apparently shopping for snacks

The journal also praised the likes of Osama bin Laden - the founder of al-Qaeda who took responsibility for the September 11 attacks, Anwar al-Awlaki, a U.S.-born cleric killed in a 2011 drone strike, and Nidal Hasan, the former U.S. Army major who went on a 2009 rampage at the Fort Hood military installation.

Prosecutors say the document ends: 'The sounds of the bombs will be heard in the streets. Gun shots to your police. Death To Your OPPRESSION.'

Federal agents would like to question Rahami. But Rep. Tom MacArthur, R-N.J., who received a classified briefing from the FBI, said Rahami was not cooperating; that could also be a reflection of his injuries.

Investigators are looking into Rahami's overseas travel, including a visit to Pakistan a few years ago, and want to know whether he received any money or training from extremist organizations.

They believe he may have received terrorist training on his 'radicalization' trip to Pakistan where he visited the Taliban stronghold of Quetta.

The federal criminal complaint details the types of bombs used in the New York and New Jersey attacks. The New York explosive devices contained aluminum powder, ammonium nitrate and HMTD - a chemical used in multiple terrorist plots against the West including the July 7, 2005, London bombings - by al Qaeda, CNN reports.

Investigators believe that Rahami's use of the chemical indicates overseas training as there have been very few 'lone wolf' attacks have successfully used the tricky substance.

The FBI is now looking into Rahami's multiple, and lengthy stays in Afghanistan and Pakistan between 2011 and 2014 to see whether there is evidence of terror training.

Rahami's first documented trip to Pakistan was in 2005, when he visited Karachi, another terrorist hotbed, aged, The New York Times reported.

In 2011, Rahami made another lengthy trip, visiting Kandahar, Afghanistan, and Quetta, Pakistan. He visited Quetta from April 2013 to March 2014.

Rahami was stopped on one trip for secondary screening, but he satisfied the questions and was cleared, a source told Fox News.

His activities while in Afghanistan and Pakistan are unknown, although he did meet and marry his wife Asia Bibi Rahimi in 2011 with whom he has a child.

Ji-fati: Tubby 'terrorist' Ahmad Khan Rahami and his brother Mohammad Khan Rahami are seen cooking during time spent in Pakistan

Rest of the family: Ahmad's siblings also include Zobyedh (left), a Rutgers student in public health, and Nasim (right), who the alleged bomber was accused of stabbing

She is currently being questioned by American authorities after being intercepted by law enforcement in the United Arab Emirates on her way from the US to Pakistan days before the terror attacks. She is currently said to be cooperating with authorities.

Rahami's mother, Najiba, also left the U.S., flying to Turkey on August 24 - a couple of weeks before her son was accused on planting multiple bombs in New Jersey and New York which injured 29 people.

That suggests that another family member recorded the cell phone video.

In 2014, the FBI opened up an 'assessment,' the least intrusive form of an FBI inquiry, based on comments from his father after a domestic dispute, the bureau said in a statement.

'The FBI conducted internal database reviews, interagency checks and multiple interviews, none of which revealed ties to terrorism,' the bureau said.

A law enforcement official said the FBI spoke with Rahami's father in 2014 after agents learned of his concerns that the son could be a terrorist.

During the inquiry, the father backed away from talk of terrorism and told investigators that he simply meant his son was hanging out with the wrong crowd, according to the official, who was not authorized to discuss the investigation and spoke to The Associated Press on condition of anonymity.

Rahami's father told reporters Tuesday outside the family's fried-chicken restaurant in Elizabeth, New Jersey, that he called the FBI at the time because Rahami 'was doing real bad,' having stabbed the brother and hit his mother. Rahami was not prosecuted in the stabbing; a grand jury declined to indict him.

'But they checked, almost two months, and they say, 'He's OK, he's clear, he's not terrorist.' Now they say he's a terrorist,' the father said. Asked whether he thought his son was a terrorist, he said: 'No. And the FBI, they know that.'

However, he denied any knowledge of his son's plans to bomb New York and New Jersey last weekend.