In a latest update amid the ongoing Afghanistan crisis, a firefight between the Afghan security forces and unknown attackers led to the death of a security officer, while, three have been injured in Kabul.

The German military confirmed a firefight broke out at the Kabul airport's north gate early on Monday between Afghan security forces and "unknown attackers."

The military said in a tweet that one Afghan security officer was killed and another three were wounded in the early morning incident.

It said that U.S. and German forces then also got involved and that there were no injuries to German soldiers.

There was no further information and it wasn't known who the attackers were.

The Taliban, who have captured the war-torn landlock country are operating outside perimeters of the Kabul airport, have until now not opened fire on NATO or Afghanistan troops within.

Monday's incident took place after at least seven Afghans died in a panicked crush of people trying to enter Kabul's international airport on Sunday, the British military said.