Law enforcement officials say the alleged terror plot against New York City may be “still alive” despite the arrest of its alleged ringleader, 24-year-old Najibullah Zazi of Denver, Colorado.

“I have never been so worried,” said one senior law enforcement official with more than a dozen years of experience in counter-terrorism investigations.

In Washington, the FBI and the Department of Homeland Security issued a bulletin to law enforcement authorities urging vigilance at so-called “soft targets” including sports stadiums and luxury hotels.

ABCNews.com reported Monday that Zazi’s computer contained information relating to New York area baseball and football stadiums and a video of Grand Central Terminal in New York.

Earlier, the FBI and Homeland Security had warned police about possible attacks on mass transit targets but said there was no evidence of any specific target or timing.

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