A senior Northland policeman is disgusted after a "blotto" 10-year-old boy was found so drunk his eyes were rolling back in his head.

Police in the Northland town of Dargaville say a man who attacked a teenage girl while she walked her dog needs to be caught before he strikes again.

Controversial MP Hone Harawira has encouraged protesters to take "whatever action necessary" to make their voices heard - earning another stinging rebuke from party bosses.