KABUL, Jan 4 (Reuters) - A large explosion was heard in the diplomatic quarter of Kabul on Saturday and security sources said a military convoy had been attacked at the entrance to a base.
Reuters reporters heard sirens and helicopters flying overhead. Details on casualties were not immediately available, but the NATO-led security force confirmed that it had sent troops to assist.
(Reporting by Jessica Donati and Mirwais Harooni; Editing by Kevin Liffey)
Our Standards: The Thomson Reuters Trust Principles.