A car bomb in the southern Iraqi city of Basra has killed around 10 people. At least 15 others were wounded in the explosion near a market and a petrol station. Nobody has claimed responsibility, but the attack has been linked to tensions between Shi’ites and Sunnis.A rise in sectarian violence in the formerly peaceful, oil-rich city prompted the prime minister to declare a state of emergency there last month, but this has not deterred militants. In Baghdad, a roadside device went off in a market, injuring at least two people. The government has imposed a curfew in a bid to reduce the risk of attacks, as al-Qaeda pledges to avenge the killing of its leader in Iraq, Abu Musab al-Zarqawi. The group has struck Shi’ite mosques, often during crowded Friday prayers, as part of a campaign to ignite a sectarian civil war.