Story highlights No one was injured, police chief says

Police on edge following the killing of five officers in Dallas

(CNN) Gunfire hit the San Antonio police headquarters, leaving bullet marks on the building and shell casings in a nearby alley, authorities said.

San Antonio police are investigating reports of a suspect seen fleeing from the alley, Police Chief William McManus said.

McManus said police got a call late Saturday night about shots fired. Officers canvassed the area, and found holes on the building and multiple shell casings.

No one was injured, but police officers inside heard gunshots strike the building, he said.

Authorities have a description of a suspect seen running from the alley, and are working to get more details.

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