The comedy, which Morris says shows "the Dad's Army side to terrorism", tells the story of four Muslims plotting an attack on the London Marathon.
However, Grahame Russell and Graham Foulkes, who both lost their sons in the 2005 bombings, said that they are unhappy with the way that the film deals with the issue of terrorism and have called for cinemas to boycott the film, according to the BBC.
Talking about the film castmember Arsher Ali said in January: "A film like this is obviously a very strong counterpoint to the very serious side of it, which none of us condone, but there are human stories that need to be told, which can be quite touching."
Morris has previously said that he doesn't set out to be controversial and, while talking about the Brass Eye paedophile special, that some people "like to complain".
