New York (CNN)Police are hunting for answers on what caused an explosion that injured 29 people in New York's Chelsea neighborhood, shortly before a second suspicious device was found nearby.
New York City Mayor Bill de Blasio told reporters early indications are that the explosion at 23rd Street and 6th Avenue in Manhattan at about 8.30 p.m. Saturday "was an intentional act."
But, he said, "there's no specific and credible threat against New York City at this time from any terror organization."
Investigators believe the blast was caused by an explosive device in or near a dumpster, a law enforcement source told CNN.
They are looking at surveillance video that appears to show a person near where the explosion occurred, in an attempt to determine if that individual is connected to the blast.
Police have increased security across New York's five boroughs as a precaution, a law enforcement source told CNN.
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