A suicide bomber attacked a convoy of foreign troops near the international airport in the Afghan capital of Kabul on Wednesday (December 11), 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.

Afghan deputy interior minister General Ayoub Salangi posted on Twitter that a bomb had been planted in a four-wheel-drive vehicle on the northern edge of the airport.

The airport is home to one of the NATO-led command's most important bases, the ISAF Joint Command, which is responsible for the day-to-day management of foreign troop operations in Afghanistan.

Attacks on the heavily guarded airport are relatively rare and the facility represents an ambitious target for insurgents.