Man dies after portable toilet fire

A man has died after suffering horrific burns in a portable toilet fire in Perth's southeastern suburbs.

The man's injuries were so severe he initially couldn't be identified.

Police have described his tattoos, shoes, belt buckle and watch in a bid to find out his identity.

It's believed he was burnt in the portable toilet fire on a new housing estate being constructed in Harrisdale on Australia Day.

He was brought to hospital in a critical condition and died on Wednesday morning.

A report will be prepared for the coroner.