Kabul  - Two NATO-led soldiers were killed in separate roadside blasts in southern Afghanistan, and an Afghan army soldier was killed in Taliban's ambush in northern region, officials said Sunday.

The soldiers died on Saturday, the same day a suicide bomber attacked the NATO headquarters in Kabul and five days before the nationwide presidential elections.

One International Security Assistance Force (ISAF) soldier was killed in a roadside blast, while the other died of wounds he sustained during in a similar attack on Thursday, the alliance military said in a statement. Both soldiers died Saturday.

The ISAF statement did not reveal the nationalities of the soldiers.

However, the British defence ministry said that one of its soldiers died in Birmingham hospital from wounds he sustained in an attack in Helmand province. The latest death took the total number of British military fatalities since 2001 in Afghanistan to 200.

A total of 265 international soldiers, more than half of them US troops, have been killed in Afghanistan so far this year. More than 100,000 foreign troops from 42 nations are currently stationed in Afghanistan.

Taliban militants attacked a convoy of Afghan army soldiers with rocket propelled grenade and small arms fire in Chardarah district of northern Kunduz province on Saturday, killing one soldier and wounding four others.

Taliban spokesman Zabiullah Mujahid claimed their forces destroyed two army vehicles and killed all the occupants.

Taliban attacks are on the rise as Afghanistan prepares for presidential elections on Thursday, the second in country's recent history.

In an unprecedented attack, a Taliban bomber detonated his explosive-filled vehicle in front NATO headquarters in Kabul city on Saturday, killing seven Afghans and wounding more than 90 people including several ISAF soldiers.

It was the first direct attack against the alliance's main military base in the county since the ouster of Taliban regime in late 2001. (dpa)