Witnesses said they saw a white van leave the scene at the time of the shooting. One resident said she heard just one shot.
"Brea itself is a very safe community, and this is very unusual for something like this to happen in our city," said Sgt. Bill Smyser from the Brea Police Department.
"We're taking this very, very seriously. I don't recall in my career of anything happening of this magnitude down in this area," he said.
The victim has only been identified as a male Hispanic.
Anyone with information is urged to call the Brea Police Department at (714) 990-7611.
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