ABC News Prime: Delta variant spreads across US; Japanese anger at Olympics; Stock market tank.

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Arkansas doctor speaks out on number of children on ventilators.

Arkansas doctor speaks out on number of children on ventilators.

Arkansas Children’s chief clinical officer says the delta variant is almost completely different from the original strain.

Climate scientists sound alarm over extreme temperatures at Tokyo Olympics.

Climate scientists sound alarm over extreme temperatures at Tokyo Olympics.

A new study warns that athletes are being asked more often to compete in environments that are becoming “too hostile” for the human body.

At least 4 local district attorneys reviewing Cuomo probe materials.

At least 4 local district attorneys reviewing Cuomo probe materials.

New York Gov. Andrew Cuomo is facing pressure to step down as Speaker Carl Heastie says he has lost the confidence of the Assembly.

Wildfires destroy homes, force evacuations in Greece.

Wildfires destroy homes, force evacuations in Greece.

More than 100 fires have burned through the region as it experiences one of its worst heat waves in three decades.

ABC News Update: FDA full approval of Pfizer vaccine could be just weeks away.

ABC News Update: FDA full approval of Pfizer vaccine could be just weeks away.

Plus, mask mandate debates rage as students go back to school and wildfires force evacuations in Greece. WATCH the ABC News Live Stream Here: SUBSCRIBE to ABC NEWS: Watch More on LIKE ABC News on FACEBOOK FOLLOW ABC News on TWITTER: #ABCNLUpdate #...