A Taliban suicide bomber blew himself up near an Afghan military bus in Kabul Sunday, killing four people in the latest attack in the Afghan capital in the final year of NATO combat operations.

A Taliban suicide bomber blew himself up near an Afghan military bus in Kabul Sunday, killing four people in the latest attack in the Afghan capital in the final year of NATO combat operations.

Two military officers and two civilians died when the bomber, who was on foot, targeted the bus taking defense ministry staff to work.

The attack followed an improvised explosive device (IED) blast on Saturday evening in which two people were wounded and a massive suicide attack on a Lebanese restaurant a week ago that killed 21 people, including 13 foreigners and the restaurant owner.

"There are four dead. Two civilians, one of them female, and two military officers. It was a suicide bombing," defense ministry spokesman General Zahir Azimi said of Sunday's attack.

At least 22 people were also injured, including two other civilians, he added.

A Taliban spokesman using a recognized Twitter account claimed responsibility for the blast in the southeast of the city shortly after 07:00 am.

The militants claimed 27 Afghan troops had been killed or wounded, though they regularly exaggerate death tolls after attacks.

About 58,000 NATO-led combat troops who are still in Afghanistan are due to leave by the end of 2014.