ST. PETERSBURG, Florida. (AP) – Big crowds turned out for the Memorial Day weekend in the U.S. amid warnings from authorities about people disregarding the coronavirus social-distancing rules and risking a resurgence of the scourge that has killed nearly 100,000 Americans. On the Navajo Nation, which sprawls across the states of Arizona, New Mexico and Utah, the number of virus cases rose by 56 on Sunday to 4,689, according to the local health department. Meanwhile, the White House broadened its travel ban against countries hit hard by the virus, saying it would deny admission to foreigners who have recently been in Brazil. Japan moved further toward reopening Monday, with plans to end a state of emergency in Tokyo and surrounding areas.