KABUL: Afghan militants killed a North-Atlantic Treaty Organization (Nato) coalition force member during an attack on the United States (US) Bagram airbase outside Kabul, Nato said in a statement on Wednesday.

The attack on the main military airfield in Afghanistan took place on Tuesday evening and the nationality of the service member could not immediately be released, a Nato official said.

The Nato statement did not identify which militant group was responsible for the attack, though most of the groups active fall under the broad umbrella of the Afghan Taliban.

Bagram air base, which is guarded by US Marines and partnered forces, frequently comes under rocket attack from militants.

Fighting in Afghanistan has escalated since most foreign forces withdrew from last year and Afghan forces are bearing the brunt of the conflict.

A Taliban government was ousted by a US-led coalition in 2001 and its militants have been waging an increasingly violent insurgency for over a decade.

On Tuesday alone, at least 25 members of the Afghan army and police were killed in clashes, an interior ministry report showed. The Nato coalition has lost nine members of its force this year. Around 13,000 Nato troops are engaged in a new two-year training mission in the region.

In addition, several thousand US military personnel are still engaged in combat duties but details of their operations have not been disclosed.

Also read: No peace until foreign troops leave Afghanistan: Taliban chief