Jalalabad, Afghanistan:  Islamic State of Iraq and Syria beheaded 15 of its own fighters due to infighting in Afghanistan's eastern province of Nangarhar, officials said, while a separate suicide attack on Thursday tore into a crowd in the provincial capital, Jalalabad, killing at least eight.

The two incidents underline the insecurity and lawlessness across Afghanistan, where thousands of civilians have been killed or wounded this year amid unrelenting violence involving militant groups including Islamic State and the Taliban.

Nangarhar, on the porous border with Pakistan, has become a stronghold for ISIS, generally known as Daesh in Afghanistan, which has grown to become one of the country's most dangerous militant groups since it appeared around the start of 2015. Attaullah Khogyani, the provincial governor's spokesman, said that the 15 ISIS fighters were executed after an infighting in the group.