A suicide car bomb attack targeted Nato troops in the Afghan capital on Tuesday, killing at least 20 people near parliament in the deadliest strike on Kabul in more than a year, an army doctor said. The Taliban, the militia leading a nearly nine-year insurgency against the Western-backed government and US-led foreign troops, claimed responsibility for the attack, saying they had targeted invading Nato forces. The bomber unleashed scenes of horror during the busy rush hour in a heavily guarded area of Kabul near parliament, a hospital run by foreigners, an army recruitment centre and the ministry of water and energy. The American University of Afghanistan is just across the road and the Kabul museum about 100 metres away. The Afghan interior ministry said Nato's International Security Assistance Force (ISAF) was the target, although the military was unable to say whether it had suffered any casualties.