Army Col. Sean Ryan, a spokesman for the coalition, told CNN the strikes on Sunday were against "a senior ISIS member, Abu al Umarayn, and several other ISIS members." 

"Al Umarayn had given indications of posing an imminent threat to coalition forces, and he was involved in the killing of American citizen and former US Army Ranger Peter Kassig," Ryan told the US-based news channel.

"He has been linked to and directly involved with executing several other prisoners as a senior ISIS member," he said.

The US-led coalition has conducted hundreds of air and artillery strikes in Syria in an attempt to drive out the terror group members out from the country.