Cartels using grenades in drug war

MEXICO CITY, March 29 (UPI) -- Hand grenades are being used in fighting between Mexican authorities and drug cartels on the U.S.-Mexican border, The Dallas Morning News reported Wednesday.

Cartels are also fighting one another to jockey for supremacy in the multi-billion-dollar-a-year trade that runs through northern Mexico towns like Nuevo Laredo.

In recent months the violence in Nuevo Laredo has claimed the lives of several police officers and left a journalist paralyzed when a grenade was thrown into a newsroom.

Officials in Mexico City have vowed to crack down on drug gangs in border towns, sending additional federal troops to the area, though to little affect.