. >> i am erik thomas. >>> tonight, restarting america, as the coronavirus death toll soars in the u.s. more than 67,000 now dead, as roughly half the states in the country reopen this week. new york city now investigating violent arrests, as officers were enforcing social distancing rules. mother than 50 summons issued. a park ranger in texas also enforcing social distancing shoved into the water. authorities concerned about crowds at reopened beaches, parks and restaurants. deputies on horseback patrolling beaches in southern california. one of america's top health officials, dr. deborah birx, calling the protests against stay at home orders devastatingly worrisome. >>> news tonight about the race for a vaccine. at least eight human trials under way around the world. the group of scientists hoping to have the results in by next month. but how many will need to get it? and the word of caution from a former head of the cdc. >>> new rule for flying. beginning tomorrow, delta, jetblue and united, the major u.s. airlines, requiring passengers to wear masks during flights. and on the groun