A base used by the U.S. Air Force in England was put on lockdown Monday after a vehicle tried to force its way onto the facility, according to officials.

“The base was locked down and emergency personnel are responding to the situation,” according to a statement on the base’s Facebook page. “Individuals in the area surrounding the installation are asked to avoid the base at this time.”

Local police said they were responding to “reports of a significant incident” at RAF Mildenhall, a British base 75 miles northeast of London where American personnel are stationed.

“Police are responding to reports of a significant incident at RAF Mildenhall, further details shortly, follow us for any updates,” Suffolk Police said.

The facility was locked down at 1 p.m. (8 a.m. ET).