Abu Mohammed Hussam, one of the campaign’s founders [Raqqa Is Being Slaughtered Silently], told The Independent up to 100 people had been forced to give blood over the past few days. Last month, a former Yazidi teenager captured and used as a sex slave by the group described how militants were forcing hostages to give their blood for transfusions.

He said this sudden drive for blood was to treat dozens of fighters badly wounded by air strikes in Kobani. Isis were forced to withdraw from the border city following a two-pronged attack from Kurdish fighters and coalition air strikes. Most of those made to give blood have reportedly been men, although he says one woman has also been ordered to do so.