Dyfed Powys Police are investigating an assault that happened in Llanelli between 11pm and midnight on Saturday.
A 12 year old girl received minor injuries in the incident.
The suspect is described as a white man aged 30-35 with short spiky dark hair. He was wearing a Scarlets rugby top and light grey tracksuit bottoms.
Anyone with information should contact Llanelli CID.
More top news
Ed Miliband paid his first visit to Wales as part of his General Election campaign, with a message that Labour would help working families.
Cardiff City were held to a dour goaless draw today as Millwall picked up what could be a valuable point in their battle to beat relegation.
Aaron Ramsey has told his English team-mates at Arsenal to beware Wales overtaking them in the FIFA rankings.