Dozens were injured in an explosion near the Chelsea neighborhood of New York City's Manhattan borough Saturday night.

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>> PHOTOS: Explosion in New York leaves dozens injured

According to WPIX and the New York Police Department, at least 29 people suffered injuries in the blast, which occurred at 131 West 23rd St., between Sixth and Seventh avenues.

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At a press conference Saturday night, Mayor Bill de Blasio called the explosion "an intentional act" but did not believe it was connected to terrorism. De Blasio also said the blast did not appear to be linked to an earlier explosion in Seaside Park, New Jersey, WPIX reported.

"New Yorkers will not be intimidated," he said. "We will not let anyone change who we are or how we go about our lives."

NYPD Special Operations tweeted that a "possible secondary device" was found near the scene in Chelsea. WPIX reported that the item was a "possible pressure cooker."

The FDNY and NYPD counterterrorism unit are investigating.

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