(Adds U.N. comments, paragraphs 3, 9-10) By Aweys Yusuf MOGADISHU, Nov 12 (Reuters) - Residents fled the Somali capital Mogadishu on Monday, adding to a growing humanitarian crisis as government forces backed by Ethiopian tanks stepped up efforts to crush Islamist-led insurgents. At least 70 people have been killed in more than a week of fighting that has driven tens of thousands of Somalis from their homes, residents and aid workers say. The United Nations said in New York that 24,000 people had fled Mogadishu in the last week, bringing the total number of internally displaced in Somalia to a record 850,000, more than half of whom left the capital this year. Hawa Amed, a 40-year-old mother of eight, said she had wanted to stay in her house deep in the sprawling Bakara Market, where allied Somali-Ethiopian troops have been hunting for the guerrillas and their hidden arms caches over the weekend. "But after two policemen were killed outside on Sunday, we had to run," she told Reuters as she left the city on foot, her youngest child strapped to her back. "We are now heading to Madina District ... we don't know how we will survive." The latest fighting killed nine out of 10 members of one family on Monday. Only a 9-year-old girl survived when an artillery shell hit them as they tried to flee. Returning from a visit to Mogadishu, European Commission officials said some 5,000 Somalis had been treated for war-related injuries in hospitals there since the start of the year, and that about a third of those were women and children. DELEGATE SOBS Describing to journalists a meeting with a 7-year-old boy who saw four of his friends torn apart by a land mine blast as they played outside, one delegate broke down in tears. In New York, U.N. humanitarian affairs chief John Holmes said civilians were increasingly bearing the brunt of the fighting. "I appeal to all those with guns, whether government, insurgent or Ethiopian troops, to refrain from indiscriminate and disproportionate attacks affecting civilians," he said. Government security forces and Ethiopian soldiers are hunting for rebel weapons in and around Bakara Market, and on Monday the city's mayor, Mohamed Dheere, called on traders to return there and reopen their shops so they could be searched. "We believe that a lot of wounded insurgents are hiding in Bakara and the surrounding areas," said one senior security officer who asked not to be named. Ethiopian and Somali government troops have been battling insurgents in the Horn of Africa nation since Addis Ababa helped the interim administration rout a group of hard-line Islamists from Mogadishu in January following a two-week war. About 1,600 Ugandan peacekeepers deployed in Mogadishu in March as the vanguard of a proposed 8,000-strong African Union force. No other nation has so far sent troops, although a similar number of Burundians are due to arrive this month. Also on Monday, Somalia's interim government ordered an independent local broadcaster, Shabelle Radio, off the air and briefly detained two of its senior staff. Earlier this year, the authorities accused Shabelle and other Somali news organizations of supporting the rebels. "This is an operation against the independent media," Shabelle's acting director Jafar Kukay told Reuters after being released from custody at a police base in Bakara. (Additional reporting by Barry Malone in Nairobi and Patrick Worsnip at the United Nations; Writing by Daniel Wallis; Editing by Xavier Briand)
