An Islamic State group flag flies over the custom office of Syria's Jarablus border gate as it is pictured from the Turkish town of Karkamis, in Gaziantep province, Turkey, Aug. 1, 2015. Reuters

The Islamic State group took credit Wednesday for the murder of two hostages, a Norwegian and a Chinese national, who the terror group had been holding in Syria since at least September. The announcement came in the militant group's latest English-language magazine, which included an image of the dead bodies of the two men, according to the Associated Press.

The caption underneath the photo of the two corpses read that they were “executed after being abandoned by kafir nations and organizations.” For the Islamic State group, also known as ISIS, “kafir” means “infidel.”

ISIS boasted in September that they were in possession of two male hostages who they said were up for sale. The hostages appeared in that issue of the terrorist group's online magazine, known as Dabiq. The two prisoners were pictured in yellow jumpsuits with the words “FOR SALE” written below.

Those two men were subsequently identified. The Norwegian was a 48-year-old from Oslo named Ole Johan Grimsgaard. The Chinese hostage was a 50-year-old from Beijing named Fan Jinghui. The circumstances surrounding their capture are not currently known.

The executions come less than a week after the deadly coordinated attacks in Paris Friday that killed 129 people and injured hundreds more. The Islamic State group took responsibility for the attacks, and the French military has since taken a more aggressive stance toward the terror group, intensifying their air strikes in Syria.

ISIS has become well known for their executions, and has conducted several high-profile murders of hostages, including U.S. journalist James Foley, who was murdered on camera in August 2014. A hooded militant was seen in that video beheading Foley, who was on his knees in the desert. Several other international citizens have since been killed by the terrorist group.

This is a developing story...