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Persecuting if not those at the capitol. we've asked but haven't heard a clarification about who or what they were talking about. >> jonathan karl live in washington. jon, thank you. now to the pandemic and a grim few milestone tonight. this evening more than 900,000 lives lost to the virus in this country, almost two years to the day the first death was reported. but there are new signs tonight that we could be turning the corner. and the new study on masks -- n-95s, surgical masks and the ones made of cloth and how much protection each provides. here's whit johnson. >> reporter: tonight, t...

Schools open, which i want and folks want as well. so my question is, do masks worn by children reduce outbreaks in schools and, therefore, make it less likely that schools have to close? >> you know, jim, i wish there was a simple answer to that. one of the real challenges in terms of the public health science is that it lags the current situation. so when you look back at the implementation of school mandates in the pre-delta phase, they were found to be effective. they were done with other measures as well, so social distancing, improving ventilation, wearing masks. those measures were show...

N-95s, surgical masks and cloth masks, and it's eye opening. the new report from the pentagon tonight after that deadly attack at the airport in kabul. 13 u.s. marines were killed. what the report now reveals. and martha raddatz is here tonight. u.s. service members arriving in eastern europe amid tensions with russia and ukraine. paratroopers from the 82nd airborne. members of the florida national guard. and the signal from vladimir putin at the opening of the olympics with china's president xi. stephanie ramos in ukraine. breaking news from minneapolis at this hour -- an immediate mora...

Now? >> there is really two reasons we wear a mask. one is to protect ourselves, and also if we happen to be infected, maybe we don't know it yet, it protects others from our spreading the virus onto others. there is no question that cloth masks do provide ample protection in terms of our spreading the virus onto others. we measure the effectiveness of these masks in terms of how well they filter out tiny particles. those n-95 masks are called n-95s because they filter out about 95% of these tiny particles in the air. kn-95s are filtering about 50% to 80% of those tiny particles. surgical mask...

And the white house also sending additional medical personnel to states dealing with surges. 1,000 military service members will become deployable next month to help with surges in various states. you'll see the positioning of critical supplies like n-95s in key areas of the country, to send those to hospitals in need. all of this happening at president biden himself becoming a close contact as a mid-level white house staffer, according to the white house, tested positive for coronavirus on monday. president biden also got a coronavirus test on monday and tested negative through a pcr test. we...