Ahmad Khan Rahami: Bombing suspect's 'personality changed after visits to Pakistan and Afghanistan'

Was he working alone, and what was the motive?

These were the two pressing questions confronting authorities in New York - a city both tense and under massive security - as officials started trying to question the man they believe was responsible for a string of explosions that rocked the region.

Ahmad Khan Rahami, a 28-year-old Afghanistan-born American, was taken into custody on Monday morning following a shootout with police in the New Jersey town of Linden. Officers had been alerted by a bar owner who discovered a man sleeping in the doorway of his premises and thought he was a vagrant.

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Mr Rahami shot and injured two police officers, and he was himself shot several times before he was detained, taken to a local hospital and dispatched for surgery. The injuries of the New Jersey officers were not serious.

Late on Monday, Mr Rahami was charged in New Jersey with five counts of attempted murder of police officers in connection with the shootout and was held on $5.2 million (£4m) bail. Federal prosecutors said they were still weighing charges over the bombings.

Just hours after the bloodied and bandaged Mr Rahami was taken away in an ambulance, the body language of New York Mayor Bill de Blasio suggested a sense of relief.

“There is no other individual we’re looking for at this point in time,” he said at the press conference, during which he said officials were not aware of a direct threat to New York. “We have every reason to believe this was an act of terror.”

Yet despite the satisfaction among officials for having quickly caught the man they believe was responsible for a series of explosions, including one in New York on Saturday evening that left almost 30 people injured, on Monday night there were as many questions as answers. Reports said that the man in custody was "not cooperating".

As New York prepared to host leaders from around the world attending the UN General Assembly, a portrait of the suspect emerged as a man whose attitude and outlook had changed, and darkened, over the last couple of years. Local media said the man who lived and worked with his parents above a fried chicken shop, had grown a beard and started wearing traditional Muslim clothes, after a series of visits to Afghanistan and Pakistan.

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CNN said Mr Rahami travelled to Afghanistan multiple times, according to law enforcement sources. He was questioned every time he returned to the United States, as is standard procedure, but was not on the radar as someone who might have been radicalised.

It said that Mr Rahami travelled to the Afghan city of Kandahar and to the Pakistani city of Quetta. Quetta is a stronghold of Islamic extremists, but also home to a large popoulation of Afghan refugees.

Reports said that while he was in Quetta in July 2011, he married a Pakistani woman. When he was questioned by immigration officials on his return to the US, he said he was visiting family and attending his uncle’s wedding.

He made a second trip to Pakistan two years later, and stayed there for a year, as did his brother, Mohammad.

Investigators said they were still searching for a motive for the blasts, which could have caused far greater damage had they been set off among larger crowds. Experts said officials had revealed that several of the devices contained Hexamethylene triperoxide diamine, or HMTD.

They said the compound was not commonly used in homemade bombs and suggested that may carry some clue for investigators.

In the New Jersey neighborhood where Mr Rahami lived with his family, residents expressed both shock and fear. Marcella Perrotti, a hair stylist, said she had visited the First American Fried Chicken shop only once and had not found a warm welcome.

“He kept himself to himself,” she said of Mr Rahami, who in 2011 sued the police for allegedly subjecting him and his family to discrimination and “selective enforcement”. “We’re all friends here, we all talk to each other. But he didn’t.”

Joseph Fioretti, a military veteran, said he refused to allow such incidents stop him going about his business. “You have to keep doing your daily routine,” he said. “You can’t let [them] win.”

Flee Jones, 27, who said he'd known Rahami since they were teenagers, told reporters that he had noticed a change in Mr Rahami's personality after a trip to Afghanistan in 2014. When Rahami returned, he “got more religious” and dressed differently than before, Jones said.

“He was more quiet and more mature,” Mr Jones said. “I said, 'Oh, where have you been?' And he said, 'Oh, vacation.' But I knew he went to Afghanistan because his little brother said it.”

Mr Rahami also reportedly had a passion for Honda Civics that were custom-built to race.

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Ryan McCann, a regular at the restaurant, told the New York Times he last ate there two weeks ago. “He was having a conversation about his cars,” Mr McCann said. “How he likes to soup ’em up and race ’em.”

Salaam Ismial, a community worker at the Al-Hadi mosque in New Jersey, told The Independent he had seen Mr Rahami at various religious festivals over the years, and at the restaurant. He said there was no indication that he had become radicalised.