At least 29 people have been injured in an explosion in the Chelsea district of New York City, officials say.
The cause of the blast late on Saturday remains unclear. Mayor Bill de Blasio described it as "intentional" but said that there were no known links to terror.
The force of the blast blew-out windows and could be heard several blocks away.
Officials later told media that a device was found at a second location in the same district.
None of the injuries is life-threatening but one is serious, New York's fire commissioner said.
Most of those hurt suffered cuts and other minor injuries from glass and other debris.
The explosion occurred around 21:00 (01:00 GMT on Sunday). Witnesses said people ran in all directions following the "incredibly loud" blast.
Unconfirmed reports said the blast went off in a dustbin. Several blocks have been closed down by police.
Mr de Blasio said: "We do not see a link to terrorism." He said it was too early to determine the cause but added: "We believe it was intentional."
He also said there was no evidence of a link to a pipe bomb explosion in neighbouring New Jersey hours earlier.