Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Powerful Explosion Rocks Kabul, Dozens Wounded by Ayaz Gul ISLAMABAD -- A suicide car bomb Saturday ripped through a crowded area outside a government building in Kabul, Afghanistan. Health Ministry spokesman Waheed Majroah confirmed to local media that the death toll has risen to at least 40, with more than 140 wounded. Thick, dark smoke could be seen rising into the sky from the central part of the capital following the explosion near the old Afghan Interior Ministry building, witnesses said. An Afghan Interior Ministry spokesman, Nasrat Rahimi, earlier confirmed casualties to VOA, saying the bomber used an explosives-filled ambulance to carry out the attack in an area where civilians had gathered in large number. The Taliban instantly took responsibility for plotting the attack. A spokesman for the insurgent group said the target was a crowd of personnel of the Afghan security force. The deadly bombing came a week after five heavily armed Taliban suicide bombers stormed Kabul's Intercontinental Hotel in a highly secured part of the city. The raid killed at least 22 people, including 14 foreigners. At least four Americans were among the dead. Back-to-back attacks in heavily guarded parts of the city have raised severe criticism of the authorities for failing to prevent the violence. "Over the years, this area has been attacked by suicide bombers. Constant intelligence and security failures, which should not be acceptable by any stretch of imagination. A national debate must start on how we can get this right," Bilal Sarwary, senior Afghan journalist, wrote on his official Twitter account. Saturday's blast came just hours after a suicide bomber detonated his explosives-filled car outside a military base in the restive southern province of Helmand. The explosion in the Nad Ali district wounded at least six government forces, officials said. The Taliban claimed responsibility, saying the attack left several soldiers dead, though insurgent claims are often inflated.