A manhunt is underway for a former law enforcement officer who allegedly opened fire at an apartment complex in Austin on Sunday, killing three people before fleeing, writes The Washington Post.

Police identified the suspect as Stephen Nicholas Broderick, 41, a former detective at the Travis County Sheriff’s Office who is considered armed and dangerous. A team of federal, state and local authorities is looking for him, interim Austin police chief Joseph Chacon said.

Broderick knew and targeted his victims, Chacon said, and authorities are concerned that he “might possibly take a hostage” while the search is underway.