Eleven people were slain in separate incidents in and around this northern Mexican metropolis, the Nuevo Leon state government said.

Assailants in pickup trucks pulled up at a public park in the Monterrey suburb of Santa Catarina early Tuesday and opened fire with assault rifles, killing five men, state Security Council spokesman Jorge Domene said.

Hours later, gunmen in SUVs gunned down four men on the street in the Monterrey neighborhood of Francisco Villa.

Armed men also dragged a woman from her home in the suburb of Escobedo, shot her in the head and dumped the body a few blocks away, Domene said.

The 11th victim was a man killed execution-style outside his home in the El Cercado neighborhood.

Monterrey, capital of Nuevo Leon and home to many of Mexico's leading industrial companies, has been the scene of a turf war between the Gulf drug cartel and the rival Los Zetas group.

The conflict has claimed some 900 lives this year in Nuevo Leon.

More than 40,000 people have died in drug-related violence nationwide since December 2006, when newly inaugurated President Felipe Calderon militarized the struggle against the cartels.