Authorities investigating possible shooting on Hwy 4 in Antioch, police say

ANTIOCH, CA (KGO) -- Authorities on Monday are investigating a possible shooting in Antioch, police said.

The incident happened on westbound Highway 4 just before Hillcrest Ave. around 6 a.m.

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Some westbound lanes briefly closed before reopening just before 7:30 a.m.

No word if there were any injuries.

This story is developing. Check back for updates.