Authorities said Monday they have made a total 13 arrests over Hong Kong's deadliest fire in decades after the blaze killed 151 people last week, a toll that could further rise.The arrests were made on suspicion of manslaughter as investigators work to piece together what led to the catastrophic fire taking hold so fast in a complex of high-rise apartments.Officials have been looking at factors including the styrofoam panels and bamboo scaffolding use in a renovation project at the site.Officials also announced Monday that some of the exterior netting used on scaffolding at the housing estate did not meet fire-resistance...