Kabul, Aug 31 (DPA) Two US soldiers were killed Monday by roadside bombs in southern Afghanistan, as NATO's top commander in the country, US General Stanley McChrystal, called for a revised strategy in the war against terrorism.

The soldiers were killed in two separate blasts in the volatile southern region, the NATO-led International Security Assistance Force (ISAF) said in a statement.

With 47 US soldiers killed in August, this month has been the deadliest for US forces since their invasion in late 2001 toppled the Taliban government.

More than 300 foreign troops have lost their lives this year, more than in any other year since the invasion.

McChrystal, in a strategic review of the war with Taliban and their associates in Al Qaeda, called the situation 'serious' but said 'success is achievable and demands a revised implementation strategy, commitment and resolve, and increased unity of effort'.