Washington,  US Special Representative for Afghan Reconciliation, Zalmay Khalilzad said that the Islamic State (IS) terror group had conducted two deadly attacks in Afghanistan earlier this week, which killed more than 50 civilians.

"The USG has assessed ISIS-K conducted the horrific attacks on a maternity ward and a funeral earlier this week in Afghanistan," Khalilzad tweeted on Thursday, adding that the terrorist group opposes a peace agreement between the Afghan government and the Taliban, reports Xinhua news aegncy.

An attack on a maternity hospital in capital Kabul killed 24 civilians and injured 16 others on Tuesday, while a suicide bomb explosion targeting a funeral in eastern Nangarhar province killed 32 people and wounded 103 others.

The Taliban said they were not behind the twin attacks.

However, after the attacks, Afghan President Mohammad Ashraf Ghani ordered national security forces to "end active defence position" and resume offensives on militant groups, including the Taliban.

Violence still lingered in the war-torn country after a peace deal was signed between the US and the Taliban in Qatar late February, which paved the way for a phased American forces' withdrawal.

The agreement faces challenges as the intra-Afghan dialogue that had been scheduled to begin on March 10 could not start due to differences over the release of 5,000 Taliban prisoners.