UPDATE (3:35 p.m.) - Viewers tell KSBY the semi-truck is still overturned and multiple tow trucks are on scene.
UPDATE (3:35 p.m.) - CHP says the driver of the semi-truck fell asleep at the wheel.
According to authorities, there are no reported injuries.
ORIGINAL STORY (2:48 p.m.) - CHP officials say a large semi-truck overturned along Highway 101 northbound off Monterey Road in Paso Robles Sunday afternoon.
In a call with KSBY News, CHP said the truck is blocking off Monterey Road, but not Highway 101.
CHP said it received an initial report on the overturned truck after 1 p.m. Sunday.
CHP officials were unable to confirm how many vehicles were involved nor if there were any injuries, but they say there are still on scene.
According to the CHP Traffic Incident Information Page, both directions of Monterey Rd. are closed while crews remove the truck.
KSBY has sent a photographer to the scene of the incident.
Investigators are looking into the cause of the incident.