Kabul , Afghanistan ( CNN ) -- An explosion took place on a road close to Kabul 's international airport Wednesday morning , the NATO-led International Security Assistance Force said . There were no ISAF casualties . Initial information indicated that the blast may have been the work of a suicide bomber , ISAF said . The Afghan interior ministry said the blast took place on Qasabah Road , which is situated to the north of Kabul International Airport . Militants have targeted the airport previously . In June , Taliban fighters armed with guns and explosives were killed by security forces after taking over a building near the airport . The Taliban said the attack was intended to target Americans in the international airport , one part of which is used by military forces and another by civilians .
The explosion may have been caused by a suicide bomber , ISAF says . Comment: Militants have targeted the international airport in the past .