It has been a bad week for the American-led "strategy" against militants from so-called Islamic State - a strategy with the US president himself views with great qualms and some reluctance.
The latest video of 21 Egyptians being beheaded in Libya is part of Islamic State's tactic to gain funding and spread fear through the threat of the knife.
Barack Obama confirms the death of Kayla Mueller, a US aid worker who had been held hostage by Islamic State militants.
Muslims demonstrating in Whitehall have challenged Prince Charles' comments over British Muslims abiding by British values.
Jordan carries out a third day of airstrikes against Islamic State targets as it "avenges" the murder of a Jordanian pilot who was burned to death by the jihadist group.
Jordanian air strikes on Islamic State group targets are "just the beginning" of its retaliation to the burning of captured pilot Moaz al-Kasasbeh.
Jordan hangs two convicted Iraqi jihadists in response to Islamic State's apparent killing of one of its fighter pilots, Muath al-Kasasbeh.
The Islamic State group releases a video which claims to show the murder of Jordanian pilot Muath al-Kasasbeh. Jordanian TV says the pilot was killed a month ago on 3 January.
Jordan says it is still ready to do a prisoner swap with IS militants for its captured pilot, even after a video was released purporting to show the killing of Japanese journalist Kenji Goto.