Global shares crumbled Thursday after U.S. President Donald Trump said the United States will institute curbs on travel from Europe as he unveiled measures to contain the coronavirus epidemic that has extracted a heavy human and economic toll worldwide.

U.S. S&P 500 futures dropped more than 3 percent, a day after the S&P 500 lost 4.89 percent, putting the index in bear market territory, defined as a 20 percent fall from a recent top.

Euro Stoxx 50 futures dived more than 5 percent to their lowest levels since mid-2016. MSCI's broadest index of Asia-Pacific shares outside Japan dropped 2 percent to its lowest level since early 2019, while the Nikkei lost 3.3 percent.