A bomb strapped to a motorcycle exploded in the center of the capital Thursday, killing at least 12 people and injuring 29, police said. At least 13 other people were killed or found dead in various parts of the country. The attack near Rusafi Square in the Rashid Street shopping area apparently targeted fruit and vegetable vendors and commercial stalls, said police Lt. Ahmed Mohammed Ali. He said the bomb was hidden in a parked motorcycle. Several shops caught fire and many of the victims were seen being driven in private cars to hospitals as ambulances were obstructed by concrete roadblocks and razor wires.