By Mirwais Harooni KABUL (Reuters) - A suicide bomber attacked a convoy of German troops near the international airport in the Afghan capital, Kabul, on Wednesday, a military official said, but there were no immediate reports of casualties. Confirmation of the attack from the NATO-led International Security Assistance Force (ISAF) came soon after a Reuters witness reported a large blast near the sprawling and heavily guarded facility, which is used by civilians and the military. "We can confirm reports of a suicide bomber who attempted to attack an ISAF convoy today," ISAF spokeswoman Lieutenant Colonel Latondra Kinley said. "The attacker was killed and there were no ISAF casualties to report." The Taliban claimed responsibility for the attack in a text message sent by spokesman Zabihullah Mujahid.