Mexico's attorney general says investigators have seized 44 tons (39 metric tons) of marijuana in Tijuana across the border from San Diego, California.

A statement from the office says that nearly 4,000 packets of drugs were found in the Granjas Familiares del Matamoros neighborhood based on a federal warrant. Mexican military and Tijuana police conducted the raid. There were no arrests.

The statement says the seizure occurred Thursday.

Tijuana is known for huge marijuana seizures because of its proximity to the U.S., including Mexico's largest to date: 148 tons (134 metric tons) found in 2010. At least seven sophisticated tunnels under the border have been found in recent years. Roughly the same amount of marijuana seized Thursday was found outside the entrance of a tunnel discovered in Tijuana in 2012.