(KTRS) – Police hope that surveillance video will help them catch the man who left an explosive outside a Riverview Gardens school last week.

There was a small explosion last Wednesday outside of Moline Elementary School, but it caused only minor damage. Police are working to determine what exploded in the bag. The video shows a man carrying the bag. He then walks out of view and when he is seen again, is no longer carrying the bag. Police found a second package, but it contained only an electronic device and no explosives.