MEXICO CITY, June 24, 2020 (Xinhua) -- People are seen on a street after an earthquake in Mexico City, capital of Mexico, on June 23, 2020. An earthquake with a magnitude of 7.4 jolted 12 km SSW of Santa Maria Zapotitlan of Mexico at 15:29:05 GMT on Tuesday, the U.S. Geological Survey said.

WASHINGTON, June 24, 2020 (Xinhua) -- Robert Redfield (1st L), director of the U.S. Centers for Disease Control and Prevention, prepares to testify before the House Energy and Commerce Committee on Oversight of the Trump Administrations Response to the COVID-19 Pandemic in Washington, D.C., the United States, on June 23, 2020. The U.S. governments top infectious disease expert Anthony Fauci said Tuesday he remains cautiously optimistic that there will be a COVID-19 vaccine at the end of this year or early 2021. He expressed his concern about rising community spread in some states. The next couple of weeks are going to be critical in our ability to address those surges, Fauci said.

MOSCOW, June 24, 2020 (Xinhua) -- People are seen at a subway station in Moscow, Russia, on June 23, 2020. Russia recorded 7,425 COVID-19 cases in the past 24 hours, taking its total to 599,705, the countrys coronavirus response center said in a statement Tuesday.

LONDON, June 24, 2020 (Xinhua) -- British Prime Minister Boris Johnson leaves 10 Downing Street in London, Britain, on June 23, 2020. Boris Johnson said Tuesday that the current 2-meter social distancing rule will be loosened from July 4 to 1 meter plus in England so as to further ease the coronavirus lockdown.