WA Police are scouring Perth's southern suburbs tonight after a man went on a 'relentless' rampage yesterday.

The 40-year-old ran from police and jumped out of a closed window before allegedly attacking two elderly women in an effort to make an escape.

Police body camera video shows the man in his underwear and holding a shovel at 7.30am, as police draw their Tasers.

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"Put the shovel down, put the shovel down now, stop… stop," police can be heard yelling in the video.

Detectives chased Laemin Forbes through a Como construction site, before police pulled their Tasers for a second time.

But again, the man runs away, jumping fences and into strangers' backyards.

Police caught up to Mr Forbes but he ran from their sights and he hasn't been seen since.

"He was desperate, he actually dove through a closed window to get out of the house," Detective Sargent Matthew Atkinson said.

'Mary' was one of two elderly women allegedly attacked on Edgecumbe Street during the southern suburbs rampage.

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"He just clocked me and pulled me backwards and down I went… you really don't have much choice in that case," she alleged.

The 84-year-old was walking her dog when the man charged towards her.

She hit her head on the concrete.

"I saw it come and I thought he's going to finish me off… but he didn't," she said.

"He's very strong and I couldn't have fought him off even if I tried, I'm just a little old lady."

Police said Mr Forbes came in contact with an 82-year-old woman next.

He allegedly stole her handbag, grabbed her keys and took her car, which was later found dumped in Huntingdale.

"We've got concerns he's going to start offending and that creates a risk for the public which is why we are deploying all our resources around the clock to find him, he is our number one priority," Detective Sargeant Atkinson said.

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Mr Forbes is described as medium build with black hair and brown eyes.

It is not known what he is wearing.

Police said he is considered to be violent and unpredictable and should not be approached under any circumstances.

If sighted, members of the community are asked not to approach Mr Forbes but to call police immediately on 131 444.

Anyone with information regarding his whereabouts should call Crime Stoppers on 1800 333 000 or report online at crimestopperswa.com.au.