Police are investigating the circumstances surrounding the death of a young man found in bush next to a park east of Perth this morning.

Rubbish collectors discovered the body of the man, believed to be aged in his 20s, face-up on grass near the intersection of Holdsworth Avenue and Millhouse Road, in Aveley, about 9.30am.

Kim Rutter, who lives opposite the park, said she saw police when she returned from taking her grandson to school.

Camera Icon Police at the scene this afternoon. Credit: Mogens Johansen/The West Australian

"I was asking them 'what's happened, what's happened' and I got some information that there was a body in the bush across the road," she said.

"That's quite concerning for us because it is only across the road and it is so close.

"They came and interviewed us and asked if we'd seen anything, which we hadn't."

Ms Rutter said police asked if they saw or heard anything today between 2am and 3am.

"We were all asleep then so we didn't hear much at all,” she said.

Police are appealing for anyone with information, or who might have seen the man in the area this morning, to call Crime Stoppers on 1800 333 000 or to make a report online at www.crimestopperswa.com.au