MONROE, Wash. -- A man sprayed an armored car driver with pepper spray, grabbed a bag of money and escaped via inner tube down a river in Washington state.

Police spokeswoman Debbie Willis says the driver was robbed late Tuesday morning while leaving a Bank of America branch in Monroe.

The Bank of America branch is located at Old Owen Road and state Route 2 in Monroe.

The robber grabbed a money bag and ran about 100 yards to a creek that runs into the Skykomish River.

One witness reported the man floated off on an inner tube. Another said he swam to an inflatable raft that may have been made from an inner tube.

The robber dressed like a construction worker, with a yellow vest, respirator mask and blue shirt.

According to the Seattle Times, the robber took out an ad on Craigslist looking to hire construction workers. He told them to show up at the river Tuesday wearing a yellow vest, mask and blue shirt.

About a dozen men showed up, looking just like the robber, and in the confusion- he got away.

Willis says investigators believe the man could have been picked up by accomplices at a nearby boat launch or park.