Police in Hamilton are searching for a seven-year-old boy who has been missing since Wednesday.Investigators say Nathaniel was last seen around 3 p.m. on Canada Day on the beach by floating inflatable playground at the Binbrook Conservation Area.He is around four feet tall with a skinny build and short, shaved hair. He was wearing a white tank top with Thomas the Train Engine pictures on the front, green shorts with a small orange logo above the left knee, and green swim goggles.Anyone with information on his whereabouts can contact police at 905-546-3886, or anonymously to Crime Stoppers at 1-800-222-8477.