Governor Pence declared an official period of mourning to begin on sunrise Monday and ordered that flags be lowered at state buildings all across Indiana to mark the tragice murder of US aid worker Peter Kassig. According to WNDU, Islamic State group militants are claiming another beheading, this time of the captured U.S. aid worker from Indianapolis. The White House says a review of a new Islamic State video confirms the death. In a graphic, nearly 16-minute video uploaded to social networks today, a black-clad militant with his face concealed stands before a severed head. The video also shows what appears to be the mass beheading of several captured Syrian soldiers. The video, posted on websites used by the group in the past, appears to be the latest in a series of grisly messages to the U.S. warning of further brutality if it does not abandon its air campaign in Iraq and Syria. Kassig, a U.S. Army Ranger, was providing medical aid to Syrians fleeing the country's civil war when he was captured inside Syria on Oct. 1, 2013. His friends say he converted to Islam in captivity and took the first name Abdul-Rahman.