Two other hotels that have seen heightened security activity are the hotels where North Korean leader Kim Jong Un and U.S. President Donald Trump are staying ahead of their historic meeting in Singapore.
Both leaders arrived on Sunday, Kim Jong Un is staying at the St. Regis hotel while Trump is staying at the Shangri La hotel a little over a kilometre away from each other.
Trump and Kim will meet on Tuesday at Sentosa, a resort island off Singapore's port with a Universal Studios theme park. leaders of North Korea and the United States have never met previously - or even spoken on the telephone.
The summit announcement came in March after several months of unprecedented cordial diplomacy between South and North Koreas, which had been adversaries for decades.
The United States, which has substantial presence in South Korea, was on a war footing with the North over Pyongyang’s nuclear and missile programs.
The development resurrected hopes that Trump and Kim could try to find a solution to the crisis on the Korean Peninsula that has escalated over the past year.
