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(Image: GETTY)

A suicide bomber entered the air base, in Bagram, on foot among a group of workers as they reported for duty in the early hours of the morning.

Once inside they detonated next to the field’s dining hall, killing four and injuring at least 14.

A Taliban spokesman has since claimed the attack for the sick terror cell, and boasted of killing American soldiers.

The victims have been confirmas US nations.

(Image: GETTY)

Many of the approximately 10,000 American soldiers still in Afghanistan are based at Bagram.

Nato sources said the explosion occurred just after 5.30 a.m. local time (1:30 AM GMT) and that there had been casualties.

Force protection and medical teams are responding to the blast at this time.

A Nato spokesperson said: “We can confirm that there was an explosion at Bagram Airfield this morning just after 5:30am.

“There have been casualties. Our Force Protection and Medical teams are responding to the situation.

“As we get more information, we will release it.”

It comes after German diplomats were targeted in a major bomb blast in Afghanistan that killed six and injured more than 120 earlier this week.

(Image: GETTY)

A huge explosion outside a German diplomatic office was claimed by the Taliban militant group, who said it was in retaliation for an air strike last week that killed dozens of Afghan civilians.

A truck packed with explosives was parked outside the building before its contents were detonated, killing one of the attackers instantly.

German soldiers later shot dead two more suspected attackers who attempted to escape on motorbikes.