amna: We start the day's other headlines in Iran where a blood he crackdown looks to have rained in widespread protests even as the threat of U.S.

Intervention remains.

President trump signaled an interest in the although he has not ruled out military action.

>> The president and his team are closely monitoring this situation, and all options remain on the table for the president.

Amna: White house press secretary Karoline Leavitt says the president was told by Tehran that some 800 scheduled executions of protesters have been halted.

Today the trump administration placed new sanctions on several Iranian officials they described as being the architect of the attacks on protesters.

T the U.N.

Today, U.S.

Ambassador Michael waltz condemned Iran for claiming that the protests were a foreign plot.

>> Regardless of its excuses, and you will hear many today from the Iranian regime and from its friends, the regime is solely, solely responsible for the economic misery of the Iranian people and the repression of their freedom, and they will be held accountable.

Amna: A u.s.-based human rights group says at least 2600 protestors have been killed by state forces.

Iran remains largely shut off from the world, as a state-imposed internet blackout remains in place.

European troops have been arriving in Greenland, after talks in Washington failed to make progress on president trump's push to take over the territory.

Danish air force troops landed late last night and nato partners including France, Germany, and others are sending small numbers of forces as well.

This comes after the Danish foreign minister said a fundamental disagreement over Greenland remains, after meeting with American officials at the white house.

Greenland residents say they are relieved to have the support from allies, but worry about what comes next.

>> I don't think facts affects trump.

And to be honest, as it seems right now, the major threats to security in Greenland comes from our U.S.

Allies.

Amna: The white house said today that the presence of new European troops in Greenland would not affect president trump's position on taking over the territory.

Federal prosecutors are charging 26 people for allegedly rigging NCAA and Chinese basketball association games.

15 of those charged played division one basketball as recently as last season.

The charges include wire fraud, bribery and conspiracy.

In a press conference today, authorities said fixers paid players up to $30,000 a game to deliberately underperform, then placed large bets against their teams.

U.S.

Attorney David Metcalf says those involved, quote, poisoned the American spirit of competition for monetary gain.

>> When criminals pollute the purity of sports by manipulating competition, it doesn't just imperil the integrity of sports betting markets, it imperils the integrity of sport itself.

Amna: The indictment claims that fixers and players tried to rig 29 games across multiple seasons, involving millions of dollars in bets.

It comes after a series of NCAA investigations that have led to at least 10 players receiving lifetime bans.

A federal appeals court today opened the possibility that Palestinian activist Mahmoud Khalil could be re-arrested and possibly deported.

The three-judge panel reversed a lower court decision that led to his release last June, saying it didn't have juridsiction.

They added that Khalil will have to wait to seek relief from allegedly unlawful government conduct.

The former Columbia university graduate student is a permanent resident whose wife and son are American.

His case became a high-profile example of the trump administration's crackdown on pro-palestinian activities on campus.

His lawyers say they plan to appeal.

Four astronauts are safely back on Earth, after nasa's first medical evacuation of the international space station.

>> Splashdown of crew 11.

Amna: The crew touched down in the pacific near San Diego early this morning.

They ended their mission more than a month early, because one of the astronauts was experiencing an undisclosed medical condition.

The astronaut has not been named, for privacy reasons.

All four were taken for medical checks when they landed, as is standard procedure.

Nasa and spacex officials say they are working to move up the launch of the next crew, currently set for mid-february.

On Wall Street today, stocks posted decent gains thanks largely to a rebound in ai-related shares.

The Dow Jones industrial average gained nearly 300 points.

The NASDAQ rose about 50 points on the day.

The S&P 500 snapped a two-day losing streak.

And the U.S.

Postal service revealed a new stamp today featuring boxing legend Muhammad Ali.

[Applause] The unveiling took place in his hometown of Louisville, Kentucky.

The stamp features a photo of Ali from 1974, with his last name in bold letters.

The postal service has printed 22 million of the Ali forever stamps, which went on sale today.

The three-time heavyweight champ once joked that he should be on a stamp someday because, as he put it, that's the only way I'll ever get licked.

Still to come on the "News hour," the confusion caused by a slashing, then restoration of, mental health and addiction funding.

The white house targets wind power projects, putting energy businesses in jeopardy.

And a cutting edge 3-d scanning technology helps to replicate classic works of art.

>> This is the pbs "News hour" from the David M. Rubenstein studio at weta in Washington,