At least 24 people have been killed in separate mass shootings in northern Mexico as the country continued to reel from drug-related violence. In Ciudad Juarez, gunmen drove up to a house where a high school party was in full swing and opened fire killing 14 people and wounding 20 others. Most of the victims were youngsters.<br/><br/>Witnesses said the gunmen drove up to the house in several cars, first shooting at people gathered outside the dwelling, then pursuing some of the youngsters who jumped over a fence to get away. It was the third mass shooting of youngsters in Mexico since September when, within two weeks, 28 youths were killed in two separate shootings at drug rehabilitation centres.<br/><br/>Meanwhile, 10 people were killed and 11 were wounded when gunmen attacked a bar in the city of Torreon, in the northern state of Coahuila. Authorities said all the victims were students aged between 19 and 25.