It was the first time in 15 months that the number of security screenings has surpassed 2 million in a single day.

The school principal says the system helped students enjoy "a close to normal" prom, and details of the plan were provided well in advance.

Moderna has asked the Food and Drug Administration for emergency use authorization of its vaccine for children 12-17.

Johnson & Johnson says the expiration date for its COVID-19 vaccine has been extended an extra six weeks after a safety review.