Local news outlets are also reporting that there are at least two other people missing.
As of 5pm on Wednesday, 480 flights had been cancelled at Hong Kong International Airport, one of the region's busiest cargo and passenger hubs, and around 600 take-offs and landings were scheduled until 6am on Thursday.
More than 60 million people across densely populated southern China ended up being in the storm's path, he said.
The sprawling Venetian casino resort was on back-up power and without air conditioning or proper lighting, according to one source.
At the Asian close Tuesday, 380 CST bunker fuel for delivery in Hong Kong was assessed at $326/mt, down $5/mt from Monday.
The No. 8 Gale or Storm Signal was issued at 5:20 a.m. on Wednesday, and was raised Increasing Gale or Storm Signal No. 9 at 8:10 a.m., the Observatory said.
Hato was packing maximum sustained winds of 165 kilometres per hour with gusts of up to 192 kph.
The South China Morning Post newspaper reported that a 30-year-old man died after he was hit by a wall felled by strong winds, and that a 62-year-old man tumbled from the 11th floor of an apartment building. The last time it went up was for Typhoon Vicente in 2012.
Hato stirred Hong Kong's Victoria Harbour, triggering massive waves which caused serious flooding in low-lying areas. Reports say roads in areas near the sea were submerged by waves crashing ashore.
The severe storm triggered the territory's first Typhoon Signal No. 10 in five years - the city's maximum category warning - as average wind speeds above 73 miles per hour were expected, according to the Hong Kong Observatory. Gusts of winds reached up to 207 kmph, throwing around debris and tearing down trees, scaffolding and cranes.
Photo taken on August 23, 2017 shows dark clouds over Hong Kong Convention and Exhibition Center, in Hong Kong, south China.
A KLM flight from Amsterdam was the only flight to land during the Wednesday morning, while an Ethiopian Airlines flight from Addis Ababa attempted a landing before aborting and redirecting to mainland China.
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