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. July 14, 2011 14 Killed in Pakistan Political Violence VOA News A family on a motorbike rides past a burning vehicle set ablaze by protesters in Karachi . Hundreds of supporters of political party Muttahida Qaumi Movement (MQM) marched on the streets to protest against the remarks of provincial minister Zulfikar Mirza Photo: Reuters A family on a motorbike rides past a burning vehicle set ablaze by protesters in Karachi , July 14, 2011 Fresh political violence in Pakistan's southern port city of Karachi has killed 14 people, while an explosion at a house has killed four people in the country's southwest. Police said Thursday the violence overnight in Karachi erupted after a senior member of the ruling Pakistan People's Party criticized the rival Muttahida Quami Movement (MQM) and its leader. Video Clip: Pakistan violence Authorities said they have arrested about 160 people following the fighting. A surge in political and ethnic violence in the city has killed at least 100 people since last week. Meanwhile, officials in the southwestern town of Chaman, along the Afghan border, said a blast ripped through a house used by Afghan refugees, killing four people and wounding 10 others. Some information for this report was provided by AP and Reuters. .