The two men and the widow of the alleged ringleader of the 2005 London bombings were freed without charge Tuesday after being questioned by police investigating the attacks, officials said.
Hasina Patel, 29, wide of Mohammed Sidique Khan - the head of the group which struck three subway cars and a double-decker bus - was arrested May 9 along with three men.
Police said three suspects had been released after questioning, but said officers continue to interview a 34-year-old man on suspicion of aiding the bombers, who killed 52 commuters and injured hundreds in attacks on July 7, 2005.
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