Passengers who were on the number 143 First bus from Redditch to Bromsgrove at about 6.10pm last Monday are being urged to come forward following reports of a robbery and assault.
Two men have been remanded in custody following the incident.
Police are keen to hear from anyone who was on the bus and saw two people got off at the Aston Fields stop.
Anyone with information can call DC Glyn Jones at Redditch CID on 08457 444888.
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