Avon and Somerset Police's handling of the search for a missing couple, who were later found buried under a landslide in Dorset, is being investigated.

The bodies of Rosemary Snell and Michael Rolfe were discovered at the entrance to Beaminster Tunnel near Dorchester, nine days after being reported missing.

The Independent Police Complaints Commission will oversee an inquiry by the Somerset force into whether more could have been done.