Part time fire-fighters in a small northern French town are suspected of asking local teenagers to set fires as a way to get more pay.

Prosecutors are questioning two more suspects who they said displayed “bizarre behaviour” in the French Riviera where forest fires believed to have been started deliberately killed four people, including two British people.

French police were today interrogating a man suspected of starting fires that swept through the hills behind the Riviera and killed at least four people.

French judicial officials have launched an investigation after a 62-year-old woman gave birth using her brother’s sperm and a donor egg from an American woman.