NEW YORK — New York city’s fire department says it has been overwhelmed by the response to a massive collapse of a steel building at a building site on the East River.

The fire department said in a news release Thursday that more than 1,000 firefighters were called to the site of the collapse on East 72nd Street just after 3 p.m. on Thursday.

The city said it is now on lockdown and that the building’s owner is being questioned by authorities.

Firefighters also worked to extinguish a blaze that broke out near the building site that was reportedly sparked by an electrical surge, according to the news release.

The cause of the fire is under investigation.

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