Mexico ? The No. 2 police officer in a Mexican border city across from Texas, was shot dead Saturday, the latest high-ranking official killed in an onslaught of attacks blamed on gangs resisting a crackdown.

Gunman sprayed Juan Antonio Roman Garcia’s car with bullets outside his home in Ciudad Juarez, officials said. The attack came months after his name appeared at the top of a hit list left at a monument for fallen police officers.

Mexico has been shaken by a wave of drug-related violence as gangs battle security forces and one another for control of trafficking routes north.

The son of suspected Sinaloa cartel chief Joaquin Guzman was killed in a shootout Thursday in another northern city. The same day, Mexico’s acting federal police chief, Edgar Millan Gomez, was gunned down in front of his Mexico City home.