Chacon said Broderick knew the victims and targeted them.
He said that Broderick was a former deputy with the Travis County sheriff's office, which is based in Austin. "We'll do our best ... to get this person in custody ... and hopefully with no more loss of life".
Austin interim police Chief Joseph Chacon identified the suspect in the shooting, described by police as a domestic situation, as 41-year-old Stephen Nicholas Broderick. They said the situation is still active and the suspect is on the run. The suspect is still at large, and residents should still shelter in place and report any suspicious activity, according to the tweet. He was wearing a gray hoodie, sunglasses and a baseball cap. He said Broderick knew the victims but didn't elaborate on how or provide a motive for the shootings. Police said a child is safe and with authorities.
"I'm a little anxious just because, you know, we know a lot of our neighbors and our dogs were here and everything but". I thought someone had just fallen down or something.
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Chacon said the three were not shot in a building but did not give any further details.
Police said the shooting was reported around noon at an apartment complex near the Great Hills Plaza and The Arboretum shopping area in northwestern Austin.
Reporters on the ground captured footage of a massive law enforcement presence.
Police said a portion of a nearby highway would be shut down in both directions. She said they responded to an area that included a strip mall, several retail stores with a large apartment complex behind it.