By Associated Press - Friday, September 22, 2017

JERSEY CITY, N.J. (AP) - An unapproved chemical used at a New Jersey construction site resulted in traffic jams and rocks and dust flying into the air from multiple outbursts.

A construction site in Jersey City was shut down on Thursday due to complaints. Workers poured a chemical into drilled holes before they left.

Jersey City Fire Chief Steve McGill says the chemical is a type of mortar that is made to break up rock, and it reacted in a way it wasn’t supposed to with the air temperature. City spokeswoman Jennifer Morrill says the city didn’t approve the chemical for use.

McGill says no one was injured by the outbursts, but windows were cracked by rocks flying into the air.

Construction official Brendan Murray says the dust is normal and disputes that rocks damaged any buildings.

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