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NYC mayor: 'We have every reason to believe that this was an act of terror'

New York City Mayor Bill de Blasio said Monday the weekend bombing in Chelsea was an act of terror, but the FBI said that there is no reason to believe a terror cell "is operating here."

"We have every reason to believe this was an act of terror," de Blasio said at a news conference.

On Saturday, a bomb exploded in the New Jersey shore town on Seaside Park, forcing the cancellation of a large charity race. Later that day, a bombing in New York's Chelsea neighborhood injured 29 people. Officers found a possible secondary device nearby. On Sunday, five additional explosive devices were found near a train station in Elizabeth, New Jersey.

On Monday, authorities identified the suspect as Ahmad Khan Rahami, a 28-year-old Afghan-born immigrant, Rahami was taken into custody after a shootout with police in Linden, New Jersey.

Authorities are not looking for other individuals at this point in time, de Blasio said.

New York Police Commissioner James O'Neill said investigators will focus on other parts of the investigation, including determining whether or not the suspect worked alone and what his motivations were.

— CNBC's Katie Little contributed to this report.