The Great Lakes Naval Station was on lockdown Friday morning after a vehicle passed through a passage entryway.
The naval station, situated in Great Lakes, said on its Facebook page at 7:20 a.m. that all entryways were shut after the occurrence.
"Run, cover up, battle! Hide in closest structure or structure," the post said.
A representative for the station said a non military personnel vehicle passed through an entryway soon after 7 a.m. ceaselessly for a vehicle or ID check.
Sergeant Christopher Covelli with the Lake County Sheriff's Office make this announcement on the lockdown: "We are advised there is no known danger to anybody outside of the base. It was accounted for to us somebody collided with a passageway door. Obscure whenever was purposeful."
Personnel are currently searching the grounds for the vehicle and its driver.
No one has been injured, the spokesman said.
The station was set to have a graduation service at 9 a.m. It has since been postponed uncertainly.