There were signs of a huge explosion on a road within the compound he said.
It was not immediately clear what caused the blast.
A spokesman for NATO's International Security Assistance Force confirmed that there had been an explosion but said it was not at NATO's Camp Phoenix, which is also on the Jalalabad road.
In May, Taliban bombers attacked a heavily fortified guest house used by Westerners in the same area.
Seven people were killed after attackers disguised in burqas detonated a suicide car bomb and clashed with guards at the "Green Village" complex used by the European Union, the United Nations and aid groups.