A person's been arrested in connection with the unsolved murders of a family from Claygate and a cyclist in the French Alps in 2012.

Saad al-Hilli, his wife Iqbal, and her mother Suhaila al-Allaf were shot dead while parked in a layby near Lake Annecy.

Their two daughters survived, while a French cyclist was also killed.

Authorities are reportedly searching properties.