Two men died after being shot at 11th and D streets just after 1 a.m. on Sunday.
Detectives haven't said what led to the shooting. Neighbors describe the area as being safe.
"It's somewhat surprising, you know?" Union City resident Dennis Delatorre said. "Not horrific. My understanding is Union City did not have a murder all of last year. It's not the report we get out of other, close by cities. "
No arrests have been made.
The Alameda County coroner has not released the names of the two men who died.