Boy dies after going missing in Perth

A young boy has died in hospital after he went missing in Perth's southern suburbs.

The boy, who WA Police say was six, was found at about 5.30pm yesterday with critical injuries a close distance from his home at Booragoon in the city's south.

Police issued an alert at 4pm yesterday, saying the boy had last been seen around Riseley Street in the suburb.

St John Ambulance took him to Fiona Stanley Hospital after he was given first aid, police said.