Three officers with the San Francisco Police Department were injured Thursday night, when the patrol cars they were in collided at a busy Mission District intersection.

According to an SFPD spokesperson, the collision occurred at 10:44 p.m. Thursday at the intersection of 15th and Mission Streets.

SFPD spokesperson Sergeant Michael Andraychak writes that "two marked SFPD radio cars were responding to a call for back up" at 15th and Valencia when the vehicles crashed into each other. "One was a single officer car; the other a two officer car," Andraychak says.

The impact was hard enough that one car was sent into afire hydrant "before coming to rest against a building."

All three of the officers suffered injuries Andraychak says are not life-threatening, and were transported to an area hospital for treatment.

It's still not clear how the crash occurred, but Andraychak that "both units were responding in emergency mode (red light and siren)," suggesting that the drivers were moving quickly, and that it might have been too loud for officers to realize they were on a collision course with their opposing numbers.

Andraychak says that SFPD's Traffic Collision Investigation Unit was expected to "work through the night" to determine how the wreck occurred, and that more information might be available later today.