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Jersey City mayor Steven Fulop said in a tweet that gunmen targeted Jewish market that was the scene of a deadly standoff amid a shooting that killed six people Tuesday.

“Based on our initial investigation (which is ongoing) we now believe the active shooters targeted the location they attacked,” Fulop wrote. “Due to an excess of caution the community may see additional police resources in the days/weeks ahead. We have no indication there are any further threats.”

New York City Mayor Bill de Blasio quote-tweeted Fulop, adding that “although there is no credible or specific threat directed against New York City, I have directed the NYPD to assume a state of high alert. Tonight, NYPD assets are being redeployed to protect key locations in the Jewish community. Tomorrow, we will announce additional measures.”

Six people were killed, including a police officer, during a shootout in Jersey City Tuesday afternoon, authorities said.