LONDON (Reuters) -Jersey police said on Sunday the death toll from an explosion at an apartment building had risen to five, and that four people remained unaccounted for as emergency services indicated they were unlikely to find any more survivors. The explosion early on Saturday morning at a block of flats on the island of Jersey, off the coast of northern France, completely destroyed the three-storey building in the island’s capital of St Helier. “The number of Islanders confirmed to have been killed in the blast is now 5. There are a number of residents, we’re working on the assumption of 4…