MANILA, Philippines, May 14 (Reuters) — A fire at a Philippine rubber slipper factory killed 31 workers on Wednesday (May 13) and dozens were missing and feared dead, government and fire officials said. Ariel Barayuga, head of the Bureau of Fire Protection (BFP), said investigators were trying to determine the cause of the blaze in the capital, Manila, that trapped workers at the two-storey factory building of Kentex Manufacturing Inc, which makes flip-flops and slippers. […]