A man suspected of attempting to detonate a car bomb in New York City has been arrested.
US Attorney General Eric Holder named the man as Faisal Shahzad, a US citizen of Pakistani origin.
He was arrested at John F Kennedy airport in New York attempting to board a flight to Dubai, Mr Holder said.
The vehicle was left in Times Square on Saturday with a bomb made from fertiliser, fireworks, petrol and propane gas tanks.
The bomb was discovered and dismantled before it could explode.
Mr Holder told a news conference that investigators were pursuing "a number of leads", adding: "We will not rest until we have brought everyone responsible to justice."
He urged the American people to "remain vigilant" and report anything suspicious to the authorities.
A dark-coloured Nissan Pathfinder was left parked in Times Square on Saturday evening with its engine running and its hazard lights flashing, with a home-made bomb inside.
Mr Holder said it "would have been a deadly attack had it been successful".
He added: "It's clear that the intent behind this terrorist act was to kill Americans."
Times Square was packed with tourists and theatre-goers when a street vendor raised the alarm.
Police evacuated a wide area of the district and closed subway lines, while a controlled explosion was carried out.
Officials said the bomb was crude, but could have sparked a "significant fireball".
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