A suicide bomber hit a German embassy vehicle in Kabul on Sunday, killing three Afghan civilians, said the government, an attack claimed by the Taliban which left six wounded. Violence has escalated this year in Afghanistan, the bloodiest period since Taliban's ouster in 2001, raising doubts about the prospects for stability despite increasing numbers of foreign troops in the country. "It was a suicide attack on the German embassy car," Ali Shah Paktiawal, a senior Kabul police official told reporters near the scene. The bomber was on foot when he attacked the embassy vehicle opposite a high school on the main road leading to the parliament building in the southwestern part of the city, he said. Another police officer said the only occupant of the vehicle, its driver, escaped unhurt. The embassy had no immediate comment on the blast, which residents said broke windows in several buildings nearby. Police had cordoned off the site and the front of the four-wheel drive embassy vehicle was partially damaged.