Ensign Melquisedet Angulo Córdova, a Special Forces sailor killed last week during Mexico’s most successful drug raid in years, received a hero’s funeral Monday—and then, on Tuesday, gunmen broke into his family's home and opened fire, killing his mother and three other family members. It was a chilling warning from the cartels to military forces in Mexico’s war on drugs that even their families will be targets. Thousands, including prosecutors and police chiefs, have been killed in the drug-related violence. But targeting a soldier’s family after he’d been killed is an extremely rare form of intimidation. The Mexican government had warned that violence could erupt in the wake of the death of drug lord Arturo Beltrán Leyva and six of his gunmen, who fell during the raid that claimed Angulo’s life.