Gardaí have appealed for help in locating missing 17-year-old Peter Collins.
He was last seen on the morning of 10 September at Merrion Road, Ballsbridge, Dublin 4.
He is 6ft, of slim build, has fair skin and dark hair.
When last seen he was wearing black runners, dark jeans and a navy adidas t-shirt with blue and white stripes.
Anyone with information is asked to contact Irishtown Garda Station on 01-6669600.
