At least 13 people have been killed in a series of bomb blasts across the Iraqi capital, Baghdad, say police and medics. At least 40 people were wounded in the explosions. The deadliest single attack, in which at least six people died, struck the south of the city. In an extended surge of violence, at least 759 people died in December alone. More than 650 have died so far in January, said AFP news agency.