Mexico is asking the U.S. to strengthen efforts to halt arms trafficking along the Mexican border, a spokesman for Mexican President Vicente Fox said Monday.
The request was delivered Friday at a U.S.-Mexico working group on arms trafficking.
It comes after recent complaints that Mexican organized crime groups have access to high-tech weaponry that could only come from the United States.
Mexican federal police and soldiers arrived in two border states this month to help control a surge in violence linked to drug trafficking groups.
Meanwhile a man was shot to death and assailants shot up a motel in what appeared to be drug-related attacks in the Mexican border city of Nuevo Laredo, despite the presence of federal forces sent to quell violence in the city across the Rio Grande from Laredo.
Assailants with automatic weapons entered the Tres Caminos motel Sunday and shot up three rooms.
No one was killed, but witnesses told police at least three men were taken from the hotel by the gunmen.
It was the most brazen attack since the Mexican president sent soldiers and federal agents to take over the city.
Violence has increased all along the border as Mexico's two main drug gangs fight to control smuggling routes.
Nuevo Laredo is on the front line of the battle.
More than 70 people have been killed there since January.