Menace hurls mystery liquid at NYPD traffic agent in daylight Brooklyn attack: cops

A menace hurled a mystery liquid at an on-duty female NYPD traffic agent in a broad daylight Brooklyn attack Wednesday, cops said. 

The male assailant threw the unknown substance at the 33-year-old agent at the busy corner of 7th Avenue and 6th Street in Park Slope — bordered by Brooklyn Methodist Hospital, a church, a Barnes & Noble and a Bank of America, cops said. 

The coward took off in a 2014 Infiniti sedan, heading west on 6th Avenue, police said. 

The agent was taken to Brooklyn Methodist Hospital, where she was listed in stable condition, authorities said. 

Investigators have not yet identified the contents of the liquid.

No arrests had been made by the early evening, and the motive for the attack is unclear. 

Another NYPD traffic agent was slapped on the hand and robbed of his summons machine in a Queens attack late last year, cops said. 

Mark Garrido, 29, was busted in the rage-fueled attack on the 56-year-old uniformed agent on 63rd Drive near Queens Boulevard back in December, police said. 

And last May, a reckless crew doused an unsuspecting NYPD traffic enforcement agent with a fire extinguisher in a twisted prank, authorities said. 

Ammar Alhesheshi, 18, as well as Escarlin Polanco and Ethan Olivo, both 19, were arrested in the attack that sent the agent to the hospital for an eye injury, cops said.