Off-duty NYPD officer 'fighting for his life' after being shot during robbery

A five-year veteran of the New York Police is "fighting for his life" after being shot Saturday night during a robbery, officials said.

The officer, who was off-duty, attempted to buy a car on Ruby Street in Brooklyn after the details of the purchase were arranged on social media, police said.

When the officer arrived, the suspect immediately displayed a gun and announced the robbery, police said.

Gunfire was exchanged, the officer was hit and taken to the hospital where he is in critical condition.

Mayor Eric Adams said that the officer was conducting a simple errand and was shot. Adams said that they would catch the person responsible for the attack.

"Please keep this young officer in your prayers," Police Commissioner Keechant Sewell said. "He is currently fighting for his life."

ABC News' Darren Reynolds contributed to this report. This is a developing story. Please check back for updates.