Authorities are asking the public to review any security or phone footage from the week before the mass shooting at Brown University in the hopes it might help investigators identify someone they believe might have been casing the scene before the attack. With the search for the shooter in its fifth day Wednesday, the city of Providence is on edge, with investigators showing no sign that they're close to figuring out who was behind Saturday's attack that killed two students and wounded nine others. The request to review older video came after authorities released several clips from the day of the attack. In all of those, the person authorities are trying to identify was masked or had their head turned.

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Photos of the two victims Mukhammad Aziz Umurzokov and Ella Cook rest among flowers and candles in front of the Van Wickle Gates as the manhun…

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A screengrab from a video released by the Providence Police Tuesday shows an individual they want to speak with who was in the proximity of th…

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A community member kneels before a makeshift memorial outside the Barus & Holley building as the manhunt continues for the gunman, followi…

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Los Angeles County District Attorney Nathan J. Hochman, with Los Angeles Police Department Chief Jim McDonnell, speaks during a press conferen…

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A student leaves flowers in front of the Van Wickle Gates as the manhunt continues for the gunman following a shooting at Brown University in …