Did Boston bombing suspects plan to party in NYC after attack?

NEW YORK New York City Police Commissioner Raymond Kelly says there is no evidence that the Boston Marathon bombing suspects were targeting New York. But he says one may have been planning to party in the city after the attack.

Kelly said Wednesday that 19-year-old Dzhokhar Tsarnaev traveled to New York at least once last fall. There is a photo of the suspect in Times Square but no evidence that he was looking at possible targets.

Kelly says he was told Tsarnaev may have been intending to come to New York to party, or for a party, sometime after the bombings. But Kelly said it's not clear if any specific plans were made.

The commissioner says the information was gleaned through interviews with the suspect.

Tsarnaev's older brother, Tamerlan, died in a shootout with police.

Earlier, investigators gleaned new insight from the carjacking victim held hostage by by the Tsarnaev brothers on Thursday night. The victim speaks little to no English, according to CBS News special correspondent John Miller, but authorities pressed him to remember recognizable words from his exchange with the bombing suspects. The suspects openly boasted to the victim in English about their role in the Boston Marathon bombing and carried out the rest of their exchange in Russian.

John Miller reports that the victim said, "'the only word I recognized was Manhattan,'" a word which "tripped a lot" of alarm for authorities, who quickly halted Amtrak service from Boston to New York, searched the trains. The tip prompted the New York Police Department to "flip on its network of license plate readers at all bridges and tunnels coming into the city," Miller said. "They loaded all the license plates associated with these guys" to prevent possible entry into Manhattan.

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Meanwhile, investigators are looking at the possibility that the Boston Marathon explosions that killed three people and wounded more than 260 were triggered by a remote-controlled device, a law enforcement source told CBS News Wednesday.

CBS News investigative senior producer Pat Milton reports that a radio-controlled type of device, like those commonly used with toy cars, or components of such a device might have been used to trigger the bombs, according to the source.

The source said analysis of the bombs remains ongoing.