Countries among the hardest hit by the coronavirus pandemic unveiled further measures on Aug. 14 to battle rising infections, as the number of cases worldwide passed 21 million.
The U.S. Department of Homeland Security said it was extending a ban on non-essential travel through border crossings with Canada and Mexico throughout most of September "to slow the spread" of the disease.
Greece reopened its main airports to more international flights on Monday, hoping to kick-start its vital tourism sector after three months in lockdown.
Tourism employs about 700,000 people and accounts for some 20% of Greece's economic output, so how the sector fares is significant for the country's recovery. Greece emerged from a decade-long debt crisis two years ago.