Masjid Hazrat Abu Bakr Islamic Center

Federal agents working with the Joint Terrorism Task Force asked their NYPD counterparts to discreetly gather intel on Najibullah.

Rather than slyly contact their list of sources and informants the NYPD canvassed the suspect’s old Flushing neighborhood and flashed around his picture.

Eventually the imam of the Masjid Hazrat Abu Bakr Islamic Center learned of the investigation and contacted the man’s family to let them know that he was subject of a law enforcement inquiry.

The feds "are mad about it," the source said.