Four survive South Australian boat capsize

Four fishermen have survived a boat capsize in South Australia after two people swam kilometres to shore in the dark. 

A man raised the alarm with authorities when he reached land just after 6am, about four hours after the boat flipped off the western coast of Yorke Peninsula. 

A second man reached the shore about an hour later as two other survivors clung to the overturned boat. 

The boat was around two kilometres from the shore when the pair were picked up by locals, The ABC reports. 

At least one man has been treated by paramedics.