Police are appealing for public assistance as they actively search for missing Vermont boy Calvin.
The 10-year-old was last seen at a church on Dorking Road and Whitehorse Road in Box Hill about 6.30pm this evening.
Police and family have concerns for Calvin's welfare due to his severe autism, being non-verbal and his age.
He does not know how to use public transport and is not familiar with the Box Hill area.
Calvin is described as Asian in appearance, 120cm tall, with a slim build and dark hair.
He was last seen wearing a dark blue and cream hooded jacket, green t-shirt, blue shorts, and black/red sneakers.
Police have released an image of Calvin in the hope that someone can provide information on his current whereabouts.
Anyone who sights Calvin or has information on his whereabouts is urged to contact Box Hill Police Station on (03) 8892 3200.
