Mortar shells rained down on homes and a small market in Somalia's capital, killing 12 people and wounding 20, witnesses said Friday. Local resident Abdi Wali said the fighting started after an insurgent attack on an Ethiopian military base, adding that he saw 12 corpses after shells landed on the market and a residential area. A doctor at Daynile Hospital said about 20 wounded, including women and children, were admitted there. Somalia has been without an effective government since 1991, when warlords overthrew a dictatorship and then turned on one another. The transitional government, formed in 2004, relies on Ethiopian troops for protection, but Islamic insurgents have gained steady power and launch near-daily attacks.