Update 10.30pm: Ellen McDonagh was found safe and well this evening in Castlebar.
Update 6pm: Gardaí are seeking the public's help to find a teenage girl missing from Co Mayo.
Ellen McDonagh is missing from the Castlebar area since yesterday.
She is 5'2", with long blonde hair tied up in a bun, of slim build with blue eyes.
When last seen Ellen was wearing a pink Superdry jacket, a black tracksuit, and black Nike runners with white soles.
Anyone with information on her whereabouts are asked to contact Gardai in Castlebar on 094-9022222.