The mother told the network she had watched a video about the conspiracy theory and said she hadn’t seen images from the bombings.
The mother wildly claimed the blood on Boylston Street was paint but then cried for the victims of the brutal blasts.
“I really feel sorry for all of them. Really feel sorry for all of them.”
The parents of Tamerlan and Dzhokhar Tsarnaev returned last year to Dagestan, one of several predominantly Muslim provinces in southern Russia, where they lived briefly before moving to the US a decade ago.
Tamerlan Tsarnaev, 26, who was killed in a gun battle with police, spent six months last year in Russia’s Caucasus, which has been ravaged for years by an insurgency led by religious extremists.