No one has been charged over attacks on forest road near Lake Annecy in French Alps

A man has been detained in connection with the unsolved case of three British family members and a French cyclist who were shot dead in the French Alps in 2012.

Saad al-Hilli, an Iraqi-born engineer, his wife, Ikbal, and her mother, Suhaila al-Allaf, were gunned down in a layby on remote forest road outside the village of Chevaline, near Lake Annecy. The couple’s two young daughters survived the attack.