An explosion has occurred close to the Ministry of Defence in the Afghan capital Kabul, a department official has told Reuters.
Witnesses separately reported hearing a large blast to the news agency.
The incident comes a day after the US secretary of defence Chuck Hagel arrived in the country on a surprise visit.
More top news
During a visit to the crash site, the boss of Lufthansa has avoided reporters' questions about the co-pilot's known depression.
One Leicestershire mother managed to get a shop worth £140.27 for just 39p, Jennifer Drew told Good Morning Britain how.
Women's rights campaigners have condemned the sentencing of Purvi Patel, who put her stillborn foetus into a bin after miscarrying at home.