The sister of Peter Chester, one of the prisoners campaigning for the right to vote, said she "absolutely hates him" and "hopes he rots" in prison for murdering her daughter.
Chester raped and strangled his seven-year-old niece, Donna-Marie Gillbanks in 1977.
More top news
UK authorities are "urgently looking into" reports British boy
Wayne Rooney and his wife Coleen are expecting their fourth child, the couple have announced.
As the silence came to an end the crowd began to applaud and people shouted "I am not afraid!" in defiance of the attacks.