Update 2.25pm November 12: David Marshall has been found safe and well.
Gardaí have thanked the public for their assistance.
Gardaí are appealing for help to find a 16-year-old boy.
David Marshall was last seen on College Street in Mullingar, Co. Westmeath, on Tuesday.
David is around five foot 10 inches tall with a slim build and blonde hair.
When last seen, he was wearing grey tracksuit pants and a navy hoody.
Anyone with information has been asked to contact Mullingar Garda Station on 0449384000 or the Garda Confidential Line on 1800 666 111.