National security experts raise alarm about potential Iranian sleeper cells in the US following military strikes on Iran's nuclear sites, citing border security concerns.

It also flagged threats from Iran against US officials, including former President Donald Trump, tied to Tehran’s vow to avenge the 2020 drone strike that killed Gen. Qasem Soleimani.

For some, it’s déjà vu. A similar panic over fears of World War III struck in 2020 after a US airstrike took out Iranian military commander Qasem Soleimani.