A teenager was indecently assaulted as he travelled on a Christchurch bus on Saturday afternoon.
The 16-year-old was travelling on the Leopard Coachlines number 5 service between New Brighton and Eastgate Mall in Linwood, Detective Brent Lyford said.
His attacker got off the bus near the mall and was last seen running east on Buckleys Rd.
Police want to hear from anyone with information on the man, described as European and in his mid-20s. He was of medium build with a chubby face, dark mid-neck length hair combed back and a goatee beard.
The boy was not injured.