Kabul - Two NATO soldiers were killed and two others were wounded in a blast in southern Afghanistan on Wednesday, the alliance said.

Another two soldiers were wounded in the explosion, the NATO-led International Security Assistance Force (ISAF) said in a statement.

The ISAF said the wounded soldiers were transported to a NATO military hospital where they are being treated.

The statement did not disclose the nationalities of the soldiers, citing the ISAF policy that does not release the nationalities of casualties prior to the relevant national authority doing so.

It also did not say where exactly in the southern region the attack took place. The majority of the forces deployed to southern Afghanistan are Canadian, British, Dutch and US troops.

The ISAF has around 47,000 troops from some 40 countries that were deployed to Afghanistan following the ouster of Taliban regime in late 2001.

The southern provinces comprise the most turbulent region in Afghanistan, where Taliban-led insurgents are entrenched. (dpa)