Boston bombing persons of interest

A Boston track coach and his teenage student are denying their involvement in the deadly Boston Marathon bombings.

The men stepped forward to identify themselves after photos of them wearing backpacks went viral online Wednesday.

The Smoking Gun identified the men as Yassine Zaimi, a 24-year-old track coach and Salaheddin Barhoum, a 17-year-old high school runner who works at Subway and posted photos to Facebook of his trip Monday. They were on Boylston Street, they say, to watch the race.

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