HOUSTON (AP) - Authorities say a Houston gunman armed with a rifle and who was hiding on a rooftop opened fire on a carload of people, killing two and injuring two others.

Police Chief Art Acevedo says the gunman ambushed the group Thursday as they arrived to settle a lingering feud with another group.

He says the suspect opened fire from the roof of an abandoned home, killing a 21-year-old man and an 18-year-old man. Another wounded man was taken to a hospital in critical condition. An 18-year-old woman was struck in the knee.

Acevedo says the gunman used an "AR-15-type rifle" with a 30-round clip. Investigators continue to search for the suspect.

Acevedo says the "coward shot these young people like they were deer."

Copyright 2019 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.