San Antonio police are investigating reports of shots fired at their headquarters late Saturday night, authorities said.
Police Chief William McManus said they found bullet marks on the wall of their headquarters and shell casings in the alley behind it.
No one was injured, he said.
The shots come as police departments nationwide remain on edge following the killing of five officers in Dallas by a gunman Thursday night.
Hours before the San Antonio shooting, Dallas police officers searched the parking garage of their headquarters after a report of a suspicious person.
The search Saturday yielded no suspects or strange items, Dallas police said.
Developing story – more to come