Officers are appealing for the public's help to identify six men following an attempted armed robbery in Plumstead.On Saturday, 10 September, at around 17:20hrs, six men entered a post office in Plumstead High Street, SE18. They asked the shop keeper for alcohol, but he refused to sell it to them.As a result, one of the suspects produced a hand gun and threatened the shop keeper.The group then left the post office at 17:22hrs and headed toward Plumstead Railway Station.