A group of thugs robbed an off-duty cop of jewelry, sparking a shootout on a Brooklyn street early Saturday, police sources said.

The unidentified cop was confronted by four to six men who robbed him of his Rolex watch, ring and jewelry on Grove Street and Wyckoff Avenue in Bushwick at around 3:40 a.m., sources said.

There was an exchange of gunfire with one of the suspects firing two rounds and the officer firing one round, sources said.

No one was injured during the shootout. The cop was taken to Wyckoff Heights Medical Center, where he was treated for tinnitus, sources said.

No arrests have been made.