A search is continuing this morning for a missing 14-year-old autistic boy in the Wheatbelt who was last seen riding his quad bike early on Sunday morning.
Dennis Dear went missing at 6.30am after he became separated from a group on quad bikes on a bush trail near Flint, 140 kilometres southeast of Perth.
Some 80 SES volunteers joined police ground teams as a police helicopter and fixed-wing plane carried out searches from the air yesterday.
A team of searchers continued throughout the night and police said mounted police have now joined the large scale search.
His quad bike was discovered in a ditch in the area on Sunday night but there has been no sign of the missing teenager who has austism.
Police say Dennis had been camping with his dad with a group of friends in the bushland area.
Fears are growing for the teenager due to the high temperatures which reached 42 degrees on Sunday. It is believed he did not take any water with him.