The French part of the Caribbean island St Martin is "95 percent destroyed" after Hurricane Irma tore through the region, top local official Daniel Gibbs said late Wednesday.

"It's an enormous catastrophe. Ninety-five percent of the island is destroyed. I'm in shock. It's frightening," said Gibbs, a former French lawmaker, speaking on Radio Caribbean International. Another official said at least six people had been killed on the French Caribbean island.