Militants detonated a device in Baghdad that released toxic fumes, killing at least three people, in the second such attack with a makeshift "chemical bomb" in two days, police and officials said today. The bomb exploded in Bayaa, in southwest Baghdad, on Wednesday. A police source put the death toll at three with 35 more hospitalised. An Interior Ministry source said six were killed and 73 wounded, including many sickened by a gas thought to be chlorine. "We were in the shops working when all of a sudden it exploded and we saw yellow fumes. Everybody was suffocating," a man at a local hospital told Reuters Television. On Tuesday, a bomb destroyed a truck carrying chlorine north of Baghdad, killing at least five people and spewing out fumes that left nearly 140 others sick, Iraqi police said.