Washington: The mother of Boston Marathon bombing suspects is a `person of interest` to federal authorities who are investigating if she had radicalised one or both of her sons, US lawmakers have said.
At the same time a separate report said she was on a federal terrorism database some 18 months before the attack.
Zubeidat Tsarnaeva was added to the classified intelligence database known by the acronym TIDE at the CIA`s request, Fox news reports.
Two key lawmakers said authorities now want to know if she helped put her son, who died a week ago following a shootout with police in Massachusetts, on the road to radicalism.
According to the report, Dutch Ruppersberger, the top Democrat on the House Intelligence Committee, told reporters that she is a person of interest to see if she helped radicalize her son, or had contacts with other people or other terrorist groups.
Tsarnaeva was put on the database after Russia told the CIA the mother and son were religious militants preparing to travel to Russia.
Zubeidat said she was not planning to travel to the US in the wake of one son`s death and the other`s arrest, though her ex-husband was planning to, the report added.