WA burglar caught in act by father and son

An intruder who was physically confronted by the father and son owners of a business he had just ram-raided is recovering in hospital with serious head injuries.

Pat Fisher, the 49-year-old owner of Mandurah lawn mower sales business Mower Magic, said he was buying fish and chips on Sunday night when a security company contacted him to advise multiple alarms had gone off.

Mr Fisher and his son drove to the business expecting the burglar to be gone.

However, when they turned up, they saw a truck and stolen trailer that had crashed through the back door of the workshop and been loaded with equipment.

"I was greeted by someone with a balaclava who was trying to give it to me," Mr Fisher told 6PR radio.

"He's seen us and tried to leg it out and that's when we pulled him up.

"He had a bit of a fall over, bit of a collapse and hit the ground, and we just basically pinned him down and tried to restrain him.

"But I think he must have given his head a bit of a belting on the way down and then we've called paramedics because he wasn't in good shape."

Mr Fisher's son spoke to police overnight after clashing with the man, saying they had done nothing wrong and the incident had happened very quickly in the dark.

"The rule of thumb is don't touch what you don't own," Mr Fisher said.

"As long as he's (the intruder) fine, that was our concern because he's had a bit of a tap on the chin on the way down and we want to make sure he's fine."

The man is in a stable condition in hospital.