(CNN) -- Three separate clashes between soldiers and gang members near the U.S. border in Mexico left a dozen people dead and 21 injured, authorities said.
At least seven of the injured were in grave condition, according to authorities.
The fatalities in the Friday attacks are believed to be nine gang members, two civilians and one soldier, Mexico's Interior Ministry said. They occurred in the municipality of Nuevo Laredo, Tamaulipas.
