A pair of would-be robbers were foiled in their attempt to rob a convenience store on River Road East late Wednesday night.
Waterloo police received a call about the incident just after 11 p.m.
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Police said two armed men went into the convenience store, one with a rifle while the other had a sledge hammer.
An altercation ensued between the clerk and the men, allowing the clerk to run out of the store and yell for help.
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The two men then fled the store empty-handed and took off in a vehicle.
One suspect was described as being five-feet-10-inches tall with a medium build. He was wearing a skeleton mask. His partner was wearing a black mask and was about six-feet tall with an average build.