Zanesville Police are investigating their fourth bank robbery in less than four months. The latest one happened this morning at the Century National Bank on Maysville Avenue. Police say just before eight o'clock two white men entered the bank armed with handguns demanding money. They were last seen wearing dark clothing and had their faces covered with bandanas. No one was injured in this morning's bank robbery and the bank reopened around one this afternoon. Zanesville Police Detective Ric Roush says crimes in smaller cities like Zanesville are beginning to compare in numbers with those in Columbus. He says both robbers fled on foot and are still on the loose tonight. If you have any information on this case you are asked to contact the Zanesville Police Department's Detective Bureau at 740-455-0700.