Fremantle Detectives have laid charges against two teenage boys after 14 reports of rocks being thrown at cars on the Kwinana Freeway on Friday night, one rock smashing a windscreen and hitting a passenger in the chest.

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Around 11.30pm police received reports of vehicles travelling north near Berrigan Drive, Cockburn Central, being hit by rocks thrown from the western side of the carriageway. This lasted for 15 minutes.

One rock, the size of a large football, smashed the windscreen of a Toyota Camry, striking a 55-year-old man in the front passenger seat in the chest. He was taken by ambulance to Fiona Stanley Hospital with non-life threatening injuries.

Inspector Dean Snashall said the man has been released from hospital. He suffered grazes and bruising.