Dublin, CA— A precautionary lockdown Tuesday at the Dublin Camp Parks garrison has been lifted after officials determined reports of an intruder were unfounded, officials with the Alameda County Sheriff's Office said.

The base was on lockdown for about five hours while law enforcement searched the area following reports of the possible intruder on base. The gates to the Dougherty Road entrance were closed and traffic was backing up at about 11 a.m. At 4 p.m., traffic in the area was starting to move onto the base.

All Clear at Camp Parks. Base lock down has been lifted. Situation unfounded. Thanks to all first responders and the community for support.

— ACSO (@ACSOSheriffs) June 21, 2016 Around 11 a.m., area residents reported hearing the following announcement: "This is not an exercise. All personnel return to your facilities and lock your doors. I repeat this is not an exercise."

Fort Hunter Liggett Public Affairs Office Spokesperson Eric Jones told Patch that multiple agencies responded to the base to assist. Law enforcement personnel from Livermore, Dublin, Pleasanton and East Bay Regional Parks Police, along with the Alameda County Sheriff's Office, Alameda County Fire and the FBI-San Francisco assisted with the search.

No shelter-in-place orders for residents in the surrounding communities were issued, although officials with the City of Dublin issued a statement advising citizens to avoid the area. Alameda County Sheriff's Spokesperson JD Nelson said the nearby Santa Rita Jail was not affected by the lockdown.



Dublin schools near the base with summer school and day-care programs in session were told to shelter-in-place after receiving reports of the situation at about 11 a.m., Dublin Unified School District officials said.

"The schools were not on lockdown; students were released to parents who arrived to pick them up, and most students have been released," District Spokesperson Michelle McDonald said at about 2:30 p.m. Camp Parks Police Department used the Alameda County Sheriff's Office's unmanned aerial vehicle to help with the search.

Using UAV to expedite search. Media stage at Arnold and Gleason area. Scene contained no immediate threat known/seen pic.twitter.com/L4OZcyoY4d

— ACSO (@ACSOSheriffs) June 21, 2016