Among the wounded are three US troops, according to U.S. Navy Captain Bill Salvin, a spokesman for the Nato-led Resolute Support mission. 12:51
A bomber is believed to have been targeting a convoy of military vehicles belonging to the Nato-led Resolute Support mission.
The officials also said a number of nearby civilian vehicles were damaged in the blast, which occured close to Massoud Square in central Kabul.
A witness told Al Jazeera that the attacker was targeting a National Defence Security (NDS) checkpoint. 12:32
-FOUR people have been killed and 22 wounded following a huge explosion near the US embassy and a NATO compound in Kabul, Afghanistan. 11:39
The cause of the blast close to the Massoud Circle remains unclear, but security officials are reportedly claiming it was a suicide bombing.
The officials also said a number of nearby civilian vehicles were damaged in the blast.
It is not known if there are any casualties or damage.
It seems a Nato convoy was targeted. pic.twitter.com/OENSw50QOO
— Massood Sanjer (@MasudSanjer) May 3, 2017
— Pajhwok Afghan News (@pajhwok) May 3, 2017
— AOC (@AOC_Security) May 3, 2017