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At a congressional hearing on Tuesday reviewing the US response to the COVID-19 crisis, CDC and Food and Drug Administration officials faced questions about the rate of testing and availability of tests. The CDC has been criticized by other health professionals for initially coming up with a faulty test for the new coronavirus and then for conducting testing too slowly and on too few people.

At 5 pm on April 27, Zhao, carrying three knives, waited for the students to be dismissed. Shortly after 6 pm, the students began going home.

At least 16 of those killed were children under age 10. Most of the passengers were Iranian, but there were also Canadians and Ukrainians on the flight as well as a few citizens of Britain, Germany and Sweden.

At meetings with pro-establishment Legislative Council (LegCo) members on the resumption of the LegCo, Lam said she has already requested the Chief Secretary for Administration and the Financial Secretary of the HKSAR government to listen to views of various sectors to formulate concrete support proposals.

Asked if any waivers were expected to be granted in the process, the official said the position of the administration was that no exemptions would be permitted. He added: "I would be hesitant to say zero waivers ever."