A Fed Ex driver with a gun attempted to enter a Naval base in New Jersey Monday morning -- as a loud noise that sounded like gunfire burst out at about the same time -- caused officials to place the Naval Engineering Center in Lakehurst, N.J. on lockdown, according to officials at the base.

Base spokeswoman Angel Lopez said security forces detained a delivery driver at one base entrance gate after he told them that he had a gun for personal protection. He was given a ticket and released.

Around the same time, Lopez says, someone reported hearing shots fired at another entrance gate. Lopez says security forces did not find any sign that a gun had been fired and believe the report was unfounded.

Detective Brian Polite of the New Jersey State Police  told the Trentonian that NJSP sent a K-9 unit and SWAT unit to "assist in the investigation."

The lockdown lasted about an hour and kept traffic from getting into or out of the base.

The base is perhaps best known as the spot where the airship Hindenberg exploded in 1937. Now known as the Naval Air Engineering Center, one of its main missions relates to the equipment used to launch aircraft from carriers at sea.

Lakehurst merged with the Army's Fort Dix and McGuire Air Force Base last year as part of a joint base initiative to make the military's first three-branch base.

The Associated Press contributed to this report.