This story concerns
"Three men convicted of bombing an Iranian mosque two days ago have been publicly executed, state media says.... The bombing killed at least 19 people during evening prayers in the south-east city of Zahedan on Thursday. The three men, who were hanged on Saturday morning "So the bombing was on Thursday and two days later the men have been charged, tried and executed not for carrying out the explosion but for "illegally bringing explosives into Iran and giving them to the main person behind the bombing.".
So does the BBC decry this summary justice? Of course not, they just report
"Authorities said they were tried and had legal representation."