Three civilians have been killed and four others injured in two Baghdad attacks on Sunday, a security source said. Security source said that three civilians were killed when unknown gunmen broke through their house in al-Dhura village in west Baghdad\'s Baya\'a district on Sunday, (Aswat al-Iraq) News Agency reported. He added that an explosive charge blew off on the roadside, close to the National Theatre in central Baghdad\'s Karrada district, wounding four persons and causing damage to a civilian car, also on Sunday. He said that a mortar shell fell on central Baghdad\'s Alawi district, close to the Iraqi Museum, but caused no human losses .