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reporter: last year, nationwide, 62% of all officer deaths in the line of duty were from covid. so, let s bring in matt gutman tonight. i wanted to get to this other headline. scientists are now tracking what they call a delta sub variant, a related strain in the uk, where cases are rising. there are reports tonight it s been found in the u.s., too. what do we know so far? reporter: david, this is one of those so-called delta-plus variants. it hass be been detected in the. it s about 6% of all cases in the uk. you mentioned it is here in the u.s. and it s of such concern that one of the former heads of the fda, scott gottlieb, wrote today, we need urgent research to figure out if this delta-plus is more transmissible. david? matt, thank you. we turn next here this evening to china. that country denying reports tonight that they have tested a nuclear-capable hypersonic missile. how would you track it if it was carrying a nuclear weapon?

Matt gutmanDelta sub variantOfficer deathsDelta plus variantsIt hassDelta plusScott gottlieb