KABUL, May 31 (Xinhua) -- Two soldiers serving the NATO-led International Security Assistance Force (ISAF) were killed and four soldiers were wounded in a suicide car bombing Saturday in eastern Afghan province of Nangahar, the military alliance said.

    An ISAF convoy was struck by a suicide vehicle-borne improvised explosive device in the region, resulting in two deaths and four injuries of the soldiers, an officer at ISAF press office confirmed with Xinhua, but did say where and when the attack happened exactly.

    An additional improvised explosive device and an unexploded ordnance were found at the site, according to the ISAF.

    The ISAF did not release the casualty's nationality, citing a policy.

    There has been no immediate responsibility claim yet but usually Taliban-related militants carry out such attacks.

    Suicide blasts are on a sharp rise across Afghanistan during the past four days and a series of bombings left dozens of people dead.

    Militants launched over 140 suicide blasts in the post-Taliban nation and a total of over 8,000 people died in insurgency-related conflicts and violence in 2007, a bloodiest year since 2001.