Charges over Perth freeway rock throwing

Two 16-year-old boys have been charged after rocks were thrown at cars on a Perth freeway, one smashing through a windscreen and hitting a man in the chest.

Fourteen people reported damage to their vehicles when rocks were thrown on the Kwinana Freeway at Cockburn Central about 11.30pm on Friday.

One rock went through the windscreen of a Toyota Camry, hitting a 55-year-old man sitting in the front passenger seat. He was treated at Fiona Stanley Hospital for non-life threatening injuries.

Police dog Mako found two boys hiding in a shed at a nearby home and police are now interviewing the two 16-year-olds.

On Saturday afternoon police charged the two boys each with 14 counts of an unlawful act with intent to harm and 14 counts of criminal damage.

Both will appear before the Perth Children's Court on January 6.