Whanganui police are still investigating an incident at Sailing Whanganui last month.

A total of six small holes - which appeared to be bullet holes - were found in the windows of the Sailing Whanganui clubhouse on Gilberd St in Castlecliff.

The club was alerted to the damage on the afternoon of June 8.

Four holes were left in a second-storey window, with one in a neighbouring window, and a final hole in a ground-floor window.

A police spokesperson said on Tuesday investigations were ongoing.