People sit on a traffic island in Kips Bay as the city continues Phase 4 of re-opening following restrictions imposed to slow the spread of coronavirus on August 17, 2020 in New York City./Credit:	Noam Galai/Getty Images

People sit on a traffic island in Kips Bay as the city continues Phase 4 of re-opening following restrictions imposed to slow the spread of coronavirus on August 17, 2020 in New York City./Credit: Noam Galai/Getty Images

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New Covid-19 cases are declining across the US, official says, but that could quickly change if people aren't careful

States across the US are now seeing a decline in coronavirus cases, a US top official said this week, though he warned things could quickly change again if Americans aren't careful.