Mayor Bloomberg has just confirmed in a presser that the two Boston bombing suspects also planned to set off a further six explosives in New York's Times Square. Authorities have surveillance material of Dzhokhar on Times Sq. in April last year. He's been there twice.
The news comes just hours after the mother of the two brothers allegedly responsible for the Boston attack launched an impassioned attack on US authorities over the death of one of her sons.
Zubeidat Tsarnaeva said she regretted moving to the United States and claimed "America took my kids away from me".
An emotional Mrs Tsarnaeva said she was told, she could not see her 19-year-old son Dzhokhar Tsarnaev, who is in hospital where US officials said he is being questioned by investigators.
She said: "They already told us that they are never going to show us Dzhokhar even if we come there, until he will be put into their jail we wouldn't be able to see him."
She said her sons were "nice boys" who "loved each other", and said they had been happy in America and had plenty of friends.