Even as the devastating fire in Tai Po raged into the night, theories swirled around the possible causes of one of Hong Kong’s deadliest blazes in recent decades, with experts and residents suggesting that a combination of factors may have been involved. Authorities vowed to investigate the cause of the deadly No 5 fire, classified as posing the highest threat level, which claimed at least 36 lives, including a firefighter, and left 29 hospitalised. Another 279 others remain missing. Suspicion...