Officers were called to the 4500 block of Bleigh Avenue in Mayfair just before 11 a.m. the department said. Reports indicated a suspect was firing a gun from inside a home, police wrote.
Responding officers found bullet "casings on the premises" and declared a barricade at 11:18 a.m., authorities said.
Footage from the scene posted to the Citizen App showed officers in tactical gear armed with long guns and a police helicopter circling overhead.
Updates will follow as information is available, the department said.
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