Graffiti threatening to kill police was found in Queens Monday, sources said .
It comes amid a rash of violence against members of the NYPD.
Two officers were shot responding to a robbery Monday night and, on Dec. 20, Detectives Wenjian Liu and Rafael Ramos were killed while sitting in their patrol car in Brooklyn.
The department has also fielded dozens of threats against police in recent weeks and made several arrests.
The graffiti that reads “PSA-9 'n' 107 Pct R Next to Die" was spotted in the basement of a building at the Pomonok Houses on Parsons Boulevard, near 65th Avenue, sources said.
Police Service Area 9 serves the Pomonok Houses. The housing project is also part of a larger area covered by the 107th Precinct, which includes Fresh Meadows, Cunningham Heights, Hilltop Village and Kew Gardens Hills as well.
It was not immediately clear if the NYPD is investigating the graffiti as a threat. The NYPD's Citywide Vandals Task Force is handling the case, sources said.