Texas police are in a standoff with a suspect after an “active shooter incident” Friday morning, the Midland Police Department said.

“We do have 11 known victims at this time,” Mayor Lori Blong said at a news conference Friday. “There’s at least one victim that is dead on the scene.”

Officers heard gunfire coming from a building in the 4600 block of West Wall Street and “worked quickly to secure and clear the area,” Police Chief Greg Snow said in a statement posted on Facebook.

“Efforts to bring the standoff with the shooter to a safe resolution are ongoing.”

Midland Memorial Hospital “has established a family reunification for victims’ families at the main campus,” hospital spokesperson Tasa Richardson said in a statement to CNN.