Pictures that emerged from the city show how ISIL had been carrying out public crucifixions in areas under its control .
1 May : ISIL carried out a total of seven public killings in the city of Raqqa in northern Syria .
Pictures that emerged from the city show how ISIL had been carrying out public crucifixions in areas under ISIL 's control .
1 May : ISIL carried out a total of seven public killings in the city of Raqqa in northern Syria .