Mexican Interior Minister Francisco Ramirez says the government will send more than 3,000 troops and police officers to the the city of Tijuana to combat drug trafficking and organized crime.
The move comes a month after seven thousand troops and police were sent to the eastern Mexican state of Michoacan curb violence between drug cartels.
Tijuana and the surrounding border region have become major transit points for drug smuggling into the United States.
Dozens of tunnels running under the border have been found in Tijuana in recent years. One discovered last January ran 720 meters from a warehouse near the Tijuana airport to a warehouse in San Diego, California. Authorities said two tons of marijuana were in the tunnel when it was unearthed.
Some information for this report was provided by AFP and AP.