Katherine Russell, the widow of Boston bomber Tamerlan Tsarnaev, has stopped co-operating with authorities as it emerged female DNA found on one of the detonated bombs does not belong to her.

Tsarnaev, who was later killed in a gunfight with authorities, called his wife in the hours after the FBI released surveillance images of him and his younger brother, Dzhokhar.

But only Russell knows what was said in the conversation, as she has stopped cooperating with authorities over recent days, the New York Times reported.

Authorities are skeptical of her insistence that she played no role in the attack or in helping the brothers escape the authorities following the release of the photographs, the Times reported.

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