(CNN) -- More than 40 people, including two police officers, were killed in a spate of shootings in the Mexican border city of Ciudad Juarez since the weekend, authorities said.
One officer was shot Tuesday night and another early Wednesday in similar circumstances, said Alexandra Folis, a spokeswoman for the Chihuahua state attorney general's office. In both instances, the officers were in uniform, but in their personal vehicles, when unknown gunmen opened fire.
Over the weekend, 33 people were killed, and nine were reported dead Monday. The violent surge is the latest chapter in a turf war between drug cartels that has left more than 400 dead in Juarez this year.
According to the Juarez police, all victims were killed in separate incidents except for those involved in a raid Sunday on a drug rehabilitation clinic.
Four armed men forced themselves into the Leyes de Reforma rehabilitation clinic and opened fire, killing five patients. A similar attack on another rehabilitation clinic happened in August last year.
This spate of killings, however, did not raise alarm in a city that has become accustomed to the violence that is attributed to the drug trade and turf wars.
"We had a noticeable spike (in killings) this weekend, but it is not something unique to this month," police spokesman Jacinto Segura said.
In February, the city's police chief quit after drug cartels threatened to kill a policeman every day that he remained on the job.
Last year, drug violence was blamed for the deaths of 78 Mexican soldiers and more than 6,000 civilians.