WILMINGTON, Del. (CBS) – The Delaware National Guard has announced it has upped security levels and measures at its location in Wilmington.

Army officials say they raised threat level after cars stopped at the gate then left. They say it has happened several times this week.

Officials would not discuss the extra security measures implemented, but did say the “safety of our personnel and security of our facilities are our top priorities.”

“We’re going to be on the safe side and we’re going to treat everything as if it has a potential to be a threat,” said Lt. Col. Len Gratteri.

Lt. Col. Gratteri says the concern came on Monday and Tuesday, when several cars drove up.

Some drivers asked for directions.  Others turned around.

“Four or five times we had this happen, so that raised a red flag to us. That’s the suspicious activity that we’re talking about,” said Lt. Col. Gratteri.

“We’ve lived near the airbase all our lives. we’ve lived here since the fifties,” said neighbor Beverly Collier.

Collier tells Eyewitness News that the upgraded threat is a concern.

“It scares me. It does scare me,” she said.

But she says it’s not out of the ordinary.

“It’s just something we’ve lived with all our lives,” she said.

Now, the FBI and Pentagon are involved. Base officials say they did the right thing by sounding the alarm.

“We’re going to find out if it was a coincidence or if it was indeed suspicious activity,” said Lt. Col. Gratteri.

CBS 3’s David Spunt contributed to this report.

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