The death toll from a suicide attack on Afghan protesters has soared to 68 as violence flares across the country ahead of elections.The bombing on Tuesday in the eastern province of Nangarhar was the latest in a wave of deadly insurgent attacks which has claimed the lives of hundreds of civilians and security forces across Afghanistan.

Provincial Governor spokesman Ataullah Khogyani said the blast wounded another 165 people.The Nangarhar health department confirmed the toll.

The dead and wounded were rushed to several hospitals in the back of pickup trucks and ambulances, overwhelming doctors and nurses as they struggled to cope with the huge number of casualties.

There has been no claim of responsibility for the massacre, but the Islamic State Group, which has carried out most of the recent suicide bombings in Afghanistan, is active in the province.