(Portland, OR) -- Three people were killed and nine were injured in shootings over the weekend in Portland. Police say it pushed them to their limits investigating the incidents. A man was killed in a shooting on Northeast Broadway. Another man died in a shooting on Southeast 148th Avenue. And a woman was killed in a shooting involving domestic violence. 33-year-old Mohamed Adan is charged with murder. In another incident, a ride-share driver was held at gunpoint. After leaving the car, the suspect fired a shot into the air. Police say they weren't able to respond to lower priority calls, including several incidents of street racing.