TRENTON, N.J. — Two state troopers who led a caravan of luxury cars at speeds of more than 100 miles per hour in March were charged Friday with records-tampering after an inquiry found they taped up their plates to conceal involvement in the improper escort, which jeopardized public safety and undermined trust in the State Police, the attorney general said.

‘‘No one is above the law,’’ Attorney General Jeff Chiesa said.

Administrative charges also were brought against four other members of the state police in the high-speed escort in 2010, and a fifth trooper for his handling of a ticket issued to the operator of a Lamborghini clocked at 116 miles per hour, also in 2010.

Sergeant First Class Nadir Nassry and Trooper Joseph Ventrella sought to conceal involvement in the March escort by using black electrical tape to alter their plates, the attorney general said.

Nassry also is accused of instructing other drivers in the caravan of high-performance vehicles to conceal or partly conceal their plates using tape or other means.

By hiding their plate numbers, the drivers sped through tolls on the Garden State Parkway without paying, the attorney general said, creating what he described as a ‘‘mirage.’’

Chiesa said the taping of the cars showed ‘‘they intended to conceal their involvement in conduct that they knew was wrong.’’

The attorney general said the time limit had expired to issue tickets to motorists in the high-speed caravans.

New escort rules are now in place, including ‘‘clear instructions on observing posted speed limits,’’ Chiesa said.

Nassry, an assistant station commander and 25-year-veteran, Thursday took responsibility for the escort. He sought leniency for Ventrella, whom he said simply followed orders.

Nassry and Ventrella were charged with falsifying or tampering with records.

Nassry, 47, and Ventrella, 28, were suspended in April.