The Baja California attorney general's office said the death toll included a police officer and the brother of a local politician, pushing the number of those slain in Tijuana this year to 606, 74 of whom have died this month, the San Diego Union-Tribune reported Monday.

Officials said groups of armed men traveling in cars shot three men to death before dawn Sunday in the east and southeast sections of Tijuana. In another incident, police officers arrested three men who were allegedly found with the body of man bound, gagged and wrapped in blankets.

Meanwhile, a group of doctors said it would stop providing medical services to protest the last week's kidnapping of Dr. Antonio Barboza, an instructor with the medical school at the University of Baja California, the Union-Tribune reported.