What threats from Iran? Did I miss something???

Pentagon: Carrier USS Nimitz Will Stay in Middle East After Threats from Iran - USNI Newshttps://t.co/uwjiV623uD pic.twitter.com/B8pe80IauX

— U.S. Naval Institute (@NavalInstitute) January 4, 2021

A couple of weeks ago there was intense military air activity by US airpower in the Middle East.

Now this.

My question.

What threats came from Iran?  Did I miss something?  Anyone have any info on this ... fully aware that we don't watch the news in the ME as closely as we should but I haven't heard even a whisper about threats.