Top stories this PM: Novavax 90% effective; UK extends lockdown; Reality Winner is free

Good evening. Here are the top stories so far today.

For more daily and weekly briefings, sign up for our newsletters here.

What happened today:

Some good vaccine news. Biotech company Novavax said its coronavirus vaccine succeeded in a final-stage clinical trial, demonstrating 90% efficacy at preventing COVID-19. Data from the study will allow Novavax to submit the shot to US regulators, which it plans to do by the end of September. Nearly 65% of the adult population has received at least one dose of a coronavirus vaccine, the CDC said.

Some bad lockdown news. Prime Minister Boris Johnson announced the UK will delay lifting its remaining COVID-19 restrictions for four weeks, until at least July 19. "I think it is sensible to wait just a little longer," Johnson said, explaining that by July 19, "we will aim to have double jabbed around two-thirds of the adult population."

Back to Reality. Reality Winner, the ex-NSA contractor convicted of leaking a report about Russia's meddling in the 2016 election, has been released from prison. Winner was sentenced to five years behind bars in 2018. "Her release is not a product of the pardon or compassionate release process," Winner's attorney pointed out, "but rather the time earned from exemplary behavior while incarcerated."

The unending epidemic. During a six-hour period this weekend, four major US cities - Savannah, Cleveland, Chicago, and Austin - experienced mass shootings, leaving 6 dead and 33 injured. Chuck Wexler, executive director of the Police Executive Research Forum, said the surge in gun violence has police officials bracing for a particularly violent summer.

Oh Joe you didn't. Johnson appeared to twice wave away President Joe Biden's interruptions Saturday while he was hosting a roundtable of world leaders at the G7 summit. Biden had wrongly suggested Johnson hadn't introduced South African President Cyril Ramaphosa. Yes, there's video.

That's all for now. See you Thursday.