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WASHINGTON (AP) -- Massachusetts Gov. Deval Patrick says surveillance video from the Boston Marathon attack shows the suspect putting his backpack down and moving away in time to avoid being injured by the blast of the bomb inside it.

Speaking Sunday on NBC, Patrick says the video clearly puts 19-year-old Dzhokhar Tsarnaev at the scene of the attack. Tsarnaev is in serious condition at a Boston hospital after his capture Friday.

Patrick says the video is pretty clear about his involvement and pretty chilling, frankly.

Boston Mayor Tom Menino says information he has indicates that the suspects acted alone. Menino tells ABC's This Week that he agreed with the decision to lock down Boston all day Friday, based on information officials had at the time.

He tells ABC's `This Week that a pipe bomb was found at another location and that another person was taken into custody. The mayor did not elaborate.

One suspect, Dzhokhar Tsarnaev, is in the hospital in serious condition. His older brother, Tamerlan, died in a police shootout Friday.

Investigators have determined the bombs were fashioned from pressure cookers packed with explosives, nails and ball bearings.

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