CIUDAD JUÁREZ, Mexico  One sign of the desperation to end organized crime in this border town is that the good guy on the police recruitment posters is not a clean-cut youth in a smart police cap, but a menacing soldier in a black mask and helmet carrying a heavy machine gun.

The poster is the government’s answer to a different sort of sign left in late January at the bottom of a monument honoring fallen police officers: a hand-scrawled list of 22 officers, 5 of whom had already been gunned down in the street. The sign warned that the others would also be killed “unless they learn.” In all, eight police officers have been assassinated here this year and three are missing.

Even by the Wild West standards of this dusty desert town, where drug dealers have long smuggled their cargo across the Rio Grande and the unsolved killings of women drew international attention, the last three months have been a blood bath, officials say.

A turf war among drug cartels has claimed more than 210 lives in the first three months of this year. Many of those killed were young gunmen from out of town. The number of homicides this year is more than twice the total number of homicides for the same period last year. Several mass graves hiding 36 bodies in all have been discovered in the backyards of two houses owned by drug dealers.