An explosion was heard in the Afghan capital, Kabul, on Wednesday, hours after US President Barack Obama left Kabul following an unannounced visit during which he signed a strategic partnership agreement.
Reuters journalists heard an explosion and police said they were investigating a blast in eastern Kabul. Obama left earlier after making a televised address to Americans from Bagram Air Base north of the capital.
A US embassy warning system urged staff to stay away from windows and take cover. The embassy is in the main diplomatic area in the center of the city.