Authorities in Western Australia are deeply concerned about the well-being of a mother and her grown-up son who have gone missing.

The police are actively seeking 63-year-old Denise Allan and her 41-year-old son, Carl Allan. The pair was last seen on Thursday, triggering an urgent search.

Investigators suspect they might be traveling in a black Ford Ranger Raptor, a vehicle possibly connected to a violent incident.

This vehicle is reportedly tied to an axe attack at Discovery Parks in Swan Valley.

During this incident, 84-year-old Eddie Bullock sustained injuries after an altercation with an unidentified person on Friday.

Denise Allan is described as 170 centimetres tall, of a medium build, with blonde hair and blue eyes. 

Carl Allan is described as about 190 centimeters tall, of a medium build, with blue eyes and brown hair.

The Ford’s licence plate is 1DM 757.

“Please share this information widely, the more people that are aware the better the chance there is of locating them quickly and safely,” Detective Senior Sergeant Steve Carter said.

Police have urged the public not to approach the pair but instead call police.

Anyone with information can contact Crime Stoppers on 1800 333 000.