Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Blast Kills 7 in NW Pakistan VOA News 03 February 2010 Pakistani officials say a roadside explosion near a girls' school in northwest Pakistan has killed at least seven people, including three U.S. soldiers. U.S. officials have not confirmed the soldiers' deaths. Pakistani officials say the dead also include four children. Fifty other people were wounded in Wednesday's blast. The attack happened in a village in the Lower Dir district near Swat Valley, a region the military largely cleared of militants in an offensive a year ago. On Tuesday, suspected U.S. drones fired missiles at several suspected militant hideouts in Pakistan's North Waziristan tribal region, killing at least 16 people. North Waziristan is known as a base for the Taliban-allied Haqqani group, which is blamed for cross-border attacks against U.S., NATO and Afghan troops in Afghanistan. U.S. officials do not publicly comment on the drone strikes, which have raised tensions between Pakistan and the United States in the past. Meanwhile, the death toll from four days of violence in Pakistan's southern port city of Karachi has reached at least 26, after at least six more people were killed Tuesday. The clashes appeared to be between activists from rival political parties - the Muttahida Qaumi Movement and the Awami National Party - which traditionally gather support from different ethnic groups. Some information for this report was provided by AP, AFP and Reuters. .