Police on Monday arrested an Afghanistan-born American who they suspect of detonating a bomb in the heart of New York City and planting other devices, capturing the 28-year-old in a dramatic gun battle that wounded him and two officers.

Officials did not offer any information on the possible motives of Ahmad Khan Rahami and said they were not looking for other suspects. New York’s mayor called the bombing that injured 29 people in the bustling Chelsea district ‘an act of terror.’

Police in Linden, New Jersey, swooped in on Rahami just hours after authorities publicly identified him as the prime suspect in the Saturday night blast and sent out an alert to millions of mobile phone users.

Authorities suspect Rahami, who lived in the neighbouring city of Elizabeth, was also behind a bomb that exploded on the New Jersey shore on Saturday, a device found near the New York blast, and up to six more devices found near the Elizabeth train station on Sunday night. The bombings and subsequent manhunt prompted even greater security in America’s biggest city, already on high alert for the gathering of world leaders at the United Nations in New York for the annual General Assembly this week. An additional 1,000 officers were deployed.

While officials did not give much information about Rahami, CNN, citing unnamed law enforcement sources, reported that Rahami traveled multiple times to Afghanistan and Pakistan in recent years, including a year-long stay in Pakistan until March 2014. Police were looking into whether he was radicalized overseas, CNN said.

The blasts, the manhunt and an apparently unrelated stabbing attack in Minnesota over the weekend recalled the tension of other recent attacks, such as the mass shootings in Orlando and San Bernardino, California.

The events also fuelled the debate about America’s security challenges seven weeks before the presidential election, with candidates Donald Trump and Hillary Clinton clashing once again on Monday.