MILWAUKEE (CBS 58) -- Milwaukee police say they're investigating a battery near Brady Street that ended in several arrests Monday night, Dec. 22.  During one of those arrests, MPD says an officer was bit by a police K-9. 

Police were called to the area near Brady Street and Arlington just after 10:30 p.m. and found a 61-year-old on the ground, unconscious.

That person was taken to an area hospital while police arrested three others -- two men, 21 and 25 years old, and a 20-year-old woman.

While officers were arresting the 25-year-old, MPD says an officer was pushed into the K-9. Both the officer and suspect were bitten and taken to an area hospital for treatment. 

Police say they're still looking for more people involved in this incident.

Anyone with information is asked to contact Milwaukee police at (414) 935-7212 or, to remain anonymous, contact Crime Stoppers at (414) 224-TIPS or P3 Tips.