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Hello from CNN, I'm Joe Beck.

With the five things you need to know for Thursday, February 1st.

U.S. intelligence suggests Iran was surprised by the drone strike Sunday that killed three American service members in Jordan,

and officials say Iranian leaders are getting nervous about some of the actions of its proxy groups in the region.

CNN's Natasha Bertrand has more from the Pentagon. of its exist in Iraq, Syria and of course the Houthis in Yemen.

And so what we're told is that when the Islamic resistance, which U.S. officials have said is responsible

for that drone attack that killed three U.S. service members, that really kind of was a wake-up call for Tehran.

And it made them nervous, and they are not seeking an all-out war

with the United States, and they have for that reason

been trying to calibrate their approach

in a way that kind of harasses

U.S. and Western interests in the region via these proxy groups but doesn't

necessarily back the United States into a corner where it feels forced to

respond in a very significant way, i.e. by striking Iran directly.

...