Tsang had actively promoted the city's cross-border police cooperation with many foreign countries, including the US, Canada, Australia and New Zealand, when he was Hong Kong's police chief, from 2011 to 2015.
Troops of a task force of the 17th Infantry Regiment scrambled to get to the mountainous area where the aircraft was believed to have crashlanded, he said.
Trump on Sunday confirmed that a US official team had arrived in the DPRK to talk about the preparation for talks between the DPRK top leader Kim Jong-un and himself, which was originally scheduled on June 12 in Singapore.
Trump and First Lady Melania were welcomed at the Imperial Palace in Tokyo by Emperor Naruhito and Empress Masako.
Trump said at a town hall event with ABC News on Tuesday that a vaccine could be ready within "three weeks, four weeks".
Trump also warned that the United States could close the whole border with Mexico for a period of time "if we find that it gets to a level where we are going to lose control or our people are going to start getting hurt."
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Trump also awarded the National Humanities Medal to three individuals and a think tank.
Trump imposed a 25 percent tariff on steel imports and a 10 percent tariff on aluminum in March, but granted temporary exemptions to Canada, Mexico, Brazil, the European Union, Australia and Argentina. The temporary exemptions were due to expire at 12:01 am (0401 GMT) on Tuesday.
Trump's rallies typically follow their own sort of script.
Trump blasted Bolton's book on Twitter last week, calling it "a compilation of lies and made up stories, all intended to make me look bad."