Somali famine: Fighting in Mogadishu after 'aid threat'
Africa Union peacekeepers say they have seized key territory from Islamist insurgents in Somalia's capital after they allegedly threatened aid camps.
The heavy fighting came a day after the UN World Food Programme airlifted in its first famine emergency aid.
An AU spokesman told the BBC the action would increase security and enable aid agencies to get food to people displaced by the severe drought.
Thousands have arrived in government-controlled suburbs in search of food.
The WFP delivery is the first airlift of food aid since the UN declared a famine in two southern areas of Somalia last week.
Al-Shabab, the al-Qaeda linked group which controls much of central and southern Somalia, has banned the WFP from its areas.
Tens of thousands of Somalis have fled these regions to Mogadishu and neighbouring Kenya and Ethiopia in search of assistance.
The UN refugee agency said on Tuesday that some 100,000 people had arrived in Mogadishu and settlements around the city in search of food and water in the past two months.
The weak interim government - backed by the 9,000-strong AU force (Amisom) - controls about 60% of the capital, Mogadishu, including the airport, the port, the presidential palace and areas around the city's largest market.
The BBC's Mohamed Dhore in Mogadishu says the fighting started just after dawn when government forces and African peacekeeping troops launched an offensive on an al-Shabab strongholds in the north of the city.
"The al-Shabab have sworn to attack the IDP [internally displaced people] camps if they don't move back to their areas - and therefore this operation was mean to ensure that this does not happen," Lt Col Paddy Ankunda, a spokesman for the AU force in Mogadishu, told the BBC's Focus on Africa programme.
"We've been able to capture three key junctions pushing the al-Shabab far behind where they can attack the IDP camps," he said.
He said Amisom now controlled eight out of Mogadishu's 16 districts, with five still contested and the insurgents in charge of three of them.
"The fact we control eight districts has enabled 80% of the population of Mogadishu to come to the areas we control," the spokesman said.
Al-Shabab has so far not responded to the claims made by Amisom.
Earlier, Col Ankunda said 41 al-Shabab fighters had surrendered.
However, he then retracted the statement, saying the 41 were civilians who had escaped to government-controlled areas after being held "hostage" by al-Shabab.
In recent weeks there had been a relative lull in the violence in Mogadishu.
But correspondents say there are fears that al-Shabab may once again carry out attacks, including suicide bombings, during the holy month of Ramadan, which starts at the weekend.
Earlier this week, Somali Foreign Minister Mohamed Ibrahim warned that more than 3.5 million people "may starve to death" in his country.
The WFP aid delivery came in by plane on Wednesday because sending it by boat would have taken months.
Challiss McDonough, a spokeswoman for the WFP, said the 10 tonnes of Plumpy'nut, a peanut-based paste high in protein and energy, would be enough to treat 3,500 malnourished children for a month.
Given the demand for food aid in Somalia, the delivery is just a drop in the ocean, says the BBC's East Africa correspondent Will Ross, in Nairobi, Kenya.
Somalia is thought to be worst-hit by the crisis, but Ethiopia, Kenya and Djibouti have also been affected.
More than 10 million people in the region are thought to be at risk from the worst drought in 60 years.