Police in a Mexican border city say a drone overloaded with illicit methamphetamine crashed into a supermarket parking lot.

Tijuana police spokesman Jorge Morrua said on Wednesday that police were alerted after the drone fell on Tuesday night near the San Ysidro crossing at Mexico’s border with California.

Six packets of the drug, weighing more than six pounds, were taped to the six-propeller remote-controlled aircraft. Morrua said authorities were investigating where the flight originated and who was controlling it. He said it was not the first time they had seen drones used for smuggling drugs across the border.

Other innovative efforts have included catapults, ultralight aircraft and tunnels.