An explosion rocked New York’s neighbourhood of Chelsea on Saturday night, injuring at least 29 people, authorities said, adding that they are investigating the blast as a criminal act not immediately linked to any terror organisation.

Mayor Bill de Blasio said early indications were that blast was intentional. He said the site of the explosion, outside on a major thoroughfare of a fashionable enclave in one of the most bustling areas of New York City, was being treated as a crime scene.

But he said there was no evidence of a “credible and specific threat” to the city. “We do not see a link to terrorism,” he added.

“It is too early to determine what the incident was caused by. We believe it was intentional. A full investigation is under way.”

A law enforcement source said an initial investigation suggested the explosion occurred in a dumpster but the cause was still undetermined. The head of the New York Police Department’s special operations division said on Twitter that a “possible secondary device has been located” in the same general area.

CNN reported that law enforcement sources believe an improvised explosive device caused the blast.

– Reuters