Thirteen people were killed and 17 others wounded on Sunday as gunmen stormed a high school party in Ciudad Juarez, a Mexican town bordering the United States.

Chihuahua's Prosecutor's Office said in a statement that the attack occurred about 01:30 a.m. local time (0730 GMT) on Sunday, inside a house in Ciudad Juarez, 1,800 km north of Mexico City.

The office also said that there were some 60 people at the party, mostly adolescent students.

Some 20 armed men entered the house and shot at them before escaping the crime scene in seven vehicles.

The injured were taken to nearby hospitals.

Doctors treating the injured said 11 people were killed on the spot and two others died at hospital due to the grave condition of their wounds.

This has been the most violent attack in Ciudad Juarez since the beginning of 2010.

The deaths were part of a weekend shoot-to-kill spree in which 24 people were killed in violence related to turf battles between drug cartels in the country.

Ciudad Juarez, a town of 1.5 million residents, holds Mexico's record in bloodshed. Last year alone, more than 2,600 people were killed there in drug-related gang crimes.

Mexico is the key transit route for U.S.-bound cocaine from South America and the country itself is a top producer of marijuana and heroin.