After the failed car bombing in Times Square, police officers, theater employees and hotel workers all told street vendor Duane Jackson, "You gotta do a T-shirt."

So he did. The shirts, emblazoned with "I saw something . . . so I said something," will be among his wares when he sets up his stand at 11 a.m. Sunday at Broadway and West 45th Street.

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Jackson, 58, and fellow vendor Lance Orton alerted police on May 1 to a Nissan Pathfinder that was emitting smoke. Inside, police found propane, M-88 firecrackers, gasoline, fertilizer and a crude timing device. Faisal Shahzad, a Pakistan-born U.S. citizen, is charged with the attempted bombing. Since the discovery, the two vendors have been hailed by city officials, President Barack Obama, tourists and city residents.

Jackson, a Times Square fixture for 12 years, said his wife helped design the shirt, which shows him with the American flag. He had eight dozen T-shirts printed up. On Friday, he started selling the shirts for $5 each at his stand. "I've probably given away more than I've sold," he said Saturday.

The shirt's slogan is a modification of the Metropolitan Transportation Authority slogan, "If you see something, say something," which the agency began using after the 9/11 attacks. MTA spokesman Kevin Ortiz said the authority allows public agencies to use the slogan for free for security purposes. He said he didn't know enough about the T-shirt to comment on it specifically.

Jackson said, "It's a great PR thing to let people know that if they see something to say something."