HERCULES, Calif. (KRON) – Police activity in Hercules led to lockdown enforcement on Wednesday evening.

As of 8:40 p.m., the lockdown had been lifted.

The Contra Costa County Sheriff’s Office had advised residents in the Trees neighborhood near Redwood Road and Lupine Road to lockdown in a safe place.

“Go inside, and close and lock all windows and doors. Stay off the phone and do not call 911 unless you need to report a life-threatening emergency,” the alert said.

Police ask you to report suspicious activity to (510) 724-1111.

This lockdown will be in effect for the next four hours unless you receive further instructions from officials.