Fire crews remain at the scene of a blaze that destroyed a Melbourne mattress store, with investigations likely to continue well into Sunday night after the fire was deemed a suspected arson attack. Emergency crews responded to several calls about a two-storey building on fire at Nunawading in the city’s east about 2.20am on Sunday. They arrived to find large plumes of smoke and flames coming out of the front of a Forty Winks store, according to the Fire Rescue Victoria assistant chief fire officer, Jamie Hansen. Sign up for Guardian Australia’s breaking news email “[Firefighters] made an internal attack