Insurgents have stepped up their efforts to derail Afghanistan’s presidential election tomorrow. Gunmen stormed a bank and battled security forces for several hours in the third major attack on Kabul in five days.Three attackers were eventually killed after soldiers and police fought their way into the building. The Taliban, the hardline Islamist regime ousted in the aftermath of 9/11, have threatened to attack polling stations and voters. It has led to a huge security clampdown in the capital and other areas. The authorities have tried to reassure the population that polling will be safe, but tensions are running high across the country.