A Mexican police commander has been shot to death outside his home in the northern border city of Nuevo Laredo.
Authorities say Enrique Cardenas was killed Thursday as he left home to take his young daughter to school.
They say the killing took place one day after another local police commander was ambushed and wounded by assailants who opened fire from a moving car.
Officials say at least five other police officers have been killed in Nuevo Laredo since the beginning of the year in a wave of violence attributed to drug traffickers battling for territory.
Earlier this year, the U.S. State Department issued travel alerts on Nuevo Laredo, prompting an angry response from the Mexican government.
Some information for this report provided by AP and Reuters.