Police investigate violent robberies in Perth's western suburbs

A 70-year-old Perth man has described the terrifying moment he was punched and had a knife held to his neck during a home invasion.

Police are investigating two violent robberies in Perth's western suburbs last month which may be linked.

Perth detectives are seeking information and witnesses to the robberies which happened on December 1 in Wembley.

The first happened about 6pm when a 70-year-old man was woken up by two dark-skinned intruders in his home on Lake Monger Drive.

They began searching through various rooms while the man managed to phone police before he was confronted by the men.

The men struck him to the head before fleeing.

The 70-year-old, Cyril Watson, spoke to the media on Tuesday about his ordeal.

He said the two men constantly asked him for money during the home invasion.

"They came up to my bed and put a knife against me neck," he said.

"They punched me in the face twice...while I was laying in the bed.

"I had the police on the phone...all of a sudden one (offender) poked his head around the door and grabbed it off me.

"Of course it was frightening."

About five minutes later, a 52-year-old man arrived at his home on Lake Monger Drive in his BMW sedan.

He was confronted by a dark-skinned man who punched and kicked him before taking his car keys and stealing his silver BMW.

About 7pm, the BMW was found by police at a nature reserve on Gravity Street in Beckenham.

Detectives are investigating if the two incidents are linked.

One offender is described as approximately 187cm tall with a solid build and short, dark, cropped hair.

He was wearing dark clothing.

Police want to speak to anyone who was in Lake Monger area between 5pm-6:30pm on December 1 who may have seen the men or the stolen BMW.

Anyone with information can call Crime Stoppers on 1800 333 000, or make a report online at www.crimestopperswa.com.au.

This story Police investigate violent robberies in Perth's western suburbs first appeared on WA Today.