New York City Mayor Michael Bloomberg and City Police Commissioner Ray Kelly said the Tsarnaev brothers - Tamerlan and Dzhokhar - had additional explosives with which they were planning to create havoc at the crowded Times Square.
Such an information has been obtained by the FBI during the interrogation of Dzhokhar, 19, who was arrested by the police at a Boston neighborhood last Friday. His elder brother was killed in a police exchange of fire last week.
"They had built these additional explosives, and we know they had the capacity to carry out the attacks," he said.
Police foiled the alleged plan by killing Tamerlan in a shootout and arresting Dzhokhar last week.
If, God forbid, they had arrived in New York City and gone to Times Square, one thing for sure, they would have seen an enormous police presence, but they would not have seen extensive networks of cameras that are part of the security initiative to help police identify suspicious movements, such as packages left unintended on the streets, the Mayor said.