Seven people were killed Saturday and four more Sunday in various sections of the city across the Rio Grande from Laredo, Texas, the Laredo Morning Times reported Tuesday.
"We have now recorded 74 deaths since Sept. 5," a federal source whose name was not reported told the newspaper.
Of those 74, 11 died in gunfights against police, three were killed by Tamaulipas state police and eight by the Mexican Army. The rest died in incidents between members of criminal organizations loyal to Miguel "Z-40" Trevino or Ivan "El Taliban" Velasquez Caballero, authorities said.
The rival groups are battling for control of drug trafficking routes through Nuevo Laredo, the Tamaulipas Attorney General's Office said.