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A Northrop Grumman RQ-4 Global Hawk mockup at the Singapore Air Show. Photo: Aviation-images.com/Universal Images Group via Getty Images

An Iranian surface-to-air missile shot down an unmanned U.S. drone in international airspace over the Strait of Hormuz — not over Iran's airspace as state media had claimed, ABC News and Reuters reported Thursday, citing U.S. officials.

Details: The AP reports Gen. Hossein Salami, commander of Iran's Revolutionary Guard, said on state TV he wanted to send "a clear message" to the U.S. that Iran does "not have any intention for war with any country, but we are ready for war," he said.

What they're saying: Iran's state-run news agency IRNA reported earlier the country's Revolutionary Guard shot down an "American spy drone" outside Iranian airspace, which it identified as an RQ-4 Global Hawk.

  • U.S. Central Command confirmed to AP and the Washington Post that Iranian forces shot down a RQ-4 Global Hawk drone early on Wednesday in "international airspace over the Strait of Hormuz."

The big picture: The U.S. announced this week it's sending an extra 1,000 troops to the Middle East in response to "hostile behavior by Iranian forces and their proxy groups" that threaten U.S. "personnel and interests." The Trump administration blames Iran for attacks on oil tankers in the Gulf this month.

  • On Monday, Iran threatened to break uranium stockpile limits set under the 2015 nuclear deal within the next 10 days.

Go deeper: Without new talks, U.S.–Iran tensions continue to escalate

Go deeper

Study: Key Antarctic ice shelf is speeding up its collapse

Pine Island Glacier calves several new icebergs on Feb. 11, 2020, as seen via satellite. Photo: NASA Earth Observatory

The Pine Island Glacier on the West Antarctic Ice Sheet is responsible for more than a quarter of Antarctica's contribution to global sea level rise over the past decades. Now, a new study shows it is more vulnerable to rapid melting than thought, because climate change is weakening its natural braking system.

Why it matters: At stake is the future of a glacier containing about 160 trillion tons of ice, which if it were all to melt into the ocean would cause about 1.6 feet of global sea level rise.

Felix Salmon, author of Capital
3 hours ago - Economy & Business

Workers are taking power back

Illustration: Aïda Amer/Axios

American workers have been losing power since 1980 — but now the tables are turning.

Why it matters: The 2010s gave us the gig economy and left millions of workers stranded seemingly forever on the precipice of financial ruin. The 2020s could be the decade when workers seize back the reins of power.

Teachers across the U.S. protest laws restricting racism lessons

Thousands of teachers and other educators held protests across the U.S. Saturday against the actions of "at least 15 Republican-led states" that aim to restrict teaching about racism in class, the Washington Post reports.

Driving the news: There were demonstrations in at least 22 cities for the "Day of Action" to raise awareness about moves to limit students' exposure to critical race theory, which links racial discrimination to the nation's foundations and legal system, per Axios' Russell Contreras.