JALALABAD, Afghanistan: Gunmen and suicide bombers dressed as border police killed at least 18 people and wounded more than 70 in an attack on a bank in the main city in Afghanistan's east Saturday, government officials said. A Reuters witness reported hearing blasts soon after the attack began and gunfire could be heard coming from the branch of the Kabulbank in Jalalabad, which handles salaries for the Afghan police and armed forces, for several hours. Gul Agha Sherzai, governor of Nangarhar province, of which Jalalabad is the capital, said 18 people had been killed, with civilians and members of Afghanistan's security forces among the dead and wounded. He said seven insurgents had attacked the bank, three of them detonating explosive vests inside the building. Ahmadzia Abdulzai, a spokesman for the Nangarhar government, said fighting had gone on for several hours and described the scene as “chaotic”. The motive for the attack was not immediately clear, although coordinated assaults by insurgents against government buildings and military bases have increased in recent years, especially in eastern provinces near the Pakistan border. Insurgents often dress in the uniforms of Afghan security forces, or as women, for such attacks. The Taliban later claimed responsibility, saying three suicide bombers had entered the bank when Afghan security forces were collecting their salaries. Taliban spokesman Zabihullah Mujahid said in a text message to Reuters that “many” members of the security forces had been killed and that fighting was continuing. It is rare for the Taliban to launch complex attacks with robbery as their primary motive. Traffic from Jalalabad to the capital, Kabul, was blocked by Afghan police and NATO-led International Security Assistance Force) (ISAF) troops, witnesses said. One man was seen earlier running from the area with his clothes covered in blood. An ISAF spokesman in Kabul said the coalition was aware of an incident in Jalalabad and was investigating. Kabulbank, is Afghanistan's politically well-connected top private lender, and is mired in a corruption scandal that could have grave political consequences for Karzai and his government. The International Monetary Fund has painted a grim picture of the government's handling of the crisis, in which hundreds of millions of dollars have been put at risk through mismanagement, fraud and bad loans, and is considering whether to renew its support for Afghanistan.