GUNMEN have killed five children and badly wounded about nine others when they opened fire in a school in the city of Kumba in Cameroon's Southwest region, officials have disclosed. The officials blamed the attack on secessionist insurgents who are seeking to form a breakaway state in Cameroon's English-speaking west, though Reuters was unable to immediately confirm that. "They attacked around noon. They found the children in class and they opened fire on them," Kumba sub-prefect Ali Anougou told Reuters. He said that nine others had been seriously wounded and sent to hospital. Anglophone secessionists have imposed curfews and closed…