An explosion was reported outside the Hamid Karzai International Airport, Kabul on Thursday. The blast happened at one of the entry gates of the airport and appears to be a suicide attack, according to US officials. Crowds of Afghans have been gathering at the gates trying to gain access to the airport. According to the sources, come of Afghans have been injured in this explosion, but there is no information yet on any casualties. Pentagon has confirmed this news. Watch this video.