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. Yemen Calls for Arrest of Opposition Tribal Leader VOA News May 26, 2011 Yemeni army soldiers man a security point near a square, the site of an anti-government protest to demand the ouster of Yemen's President Ali Abdullah Saleh, in Sanaa May 25, 2011 Photo: Reuters Yemeni army soldiers man a security point near a square, the site of an anti-government protest to demand the ouster of Yemen's President Ali Abdullah Saleh, in Sanaa May 25, 2011 Yemeni President Ali Abdullah Saleh has ordered the arrest of an opposition tribal chief whose supporters have been engaged in deadly clashes with government forces since Monday. The defense ministry announced the arrest order for Sheikh Sadiq al-Ahmar on Thursday, as loyalists to the Hashid tribe chief continued fighting Yemeni forces in the capital, Sana'a. Western news reports quote government sources and witnesses as saying at least 24 people were killed in fighting late Wednesday and early Thursday. Scores of soldiers, tribesmen and soldiers were killed in the unrest earlier this week. Separately, the defense ministry says 28 people died following an explosion at a weapons storage facility the capital. However, the Associated Press says opposition activists dispute the account and say the deaths resulted from the government's heavy shelling in a residential area. Earlier Thursday, witnesses reported heavy shelling and loud explosions in Sana'a. Witnesses also say electricity has been intermittent and opposition fighters have taken control of several government buildings, including the offices of the state news agency, Saba. Many residents fled the fighting by car on Wednesday. The U.S. State Department ordered non-essential diplomats and embassy family members to leave Yemen. The State Department said that Yemen's security threat level is "extremely high due to terrorist activities and civil unrest." Yemen's president has again ruled out a voluntary exit. On Wednesday, he condemned U.S.-backed efforts to negotiate his departure after nearly 33 years of authoritarian rule. He told the Reuters news agency that he "does not take foreign orders." Meanwhile, thousands of protesters again marched through the capital, not far from the clashes, calling on President Saleh to step down. Some information for this report was provided by AP, AFP and Reuters. Follow our Middle East reports on [1]Twitter and discuss them on our [2]Facebook page. References 1. http://twitter.com/VOAMiddleEast 2. http://www.facebook.com/pages/VOAMiddleEastVoices/124360240958667?%20%20%20%20v=wall .