Luke Air Force Base tweeted on Thursday night that security forces were responding to the threat and people should avoid the area.

“56th Fighter Wing Security Forces is currently responding to reports of a bomb threat at the South Gate on Litchfield Ave,” the post read. “We ask everyone to avoid this area until the threat has been contained.”

In a statement to Newsweek on Friday, a Glendale Police spokesperson said the driver had driven up to the south gate of the base and stated that he thought an unknown person had placed an explosive device on his vehicle.

The area was secured and locked down, and all occupants were safely removed from the vehicle and were cooperating with authorities.

The Glendale Explosive Ordnance Disposal team swept the vehicle for threats, with the help of air force base personnel, but none were found.

Further investigation determined that the driver has a mental health condition. He was transported to a medical facility for further treatment. It is not known if charges will follow.

This is the second false alarm at the base in recent months. During a training exercise on February 26, authorities were informed of a potential “real-world security incident” at the site.

The training exercise was halted after reports that there was a person armed with a weapon inside a medical facility at the base, according to local TV network ABC 15.

Around an hour later, Luke Air Force Base said in a statement that there was no threat. It was later determined that an individual had “made a statement that was misinterpreted by several others” as a claim to have a weapon.

“We were fortunate this turned out to be a false alarm. However, I think we will all sleep better knowing the teams tasked to protect our airmen, civilians and families are comprised of highly capable and vigilant professionals,” said Brigadier General Gregory Kreuder, 56th Fighter Wing commander at the base.

The Air Force had tweeted on February 25 that there would be a routine active shooter training exercise at the base the following morning, and that there would be no threat to the public or base population.

Law enforcement officials from Glendale Police and Maricopa County Sheriff’s Office were present for the training exercise.

Update 7/2/2021 11:30 a.m. ET: This article was updated with a statement from Glendale Police declaring that the incident on Thursday night was a false alarm.