The NY Times reports:

Dozens of Iranians and Iranian-Americans were held for hours at Washington State’s border with Canada over the weekend as the Department of Homeland Security ramped up security at border ports after Iran threatened to retaliate against the United States for the strike that killed its top military leader.

More than 60 of the travelers, many returning from work trips or vacations, were trying to come home to the United States on Saturday when agents at the Peace Arch Border Crossing in Blaine, Wash., held them for additional questioning about their political views and allegiances, according to advocacy groups and accounts from travelers.

CBP says it’s not true, it was just a busy time at the border.

While border officers are not permitted to refer someone for what is known as a “secondary screening” of questioning based solely on national origin, it is one of multiple factors they are directed to consider, in addition to travel documents, travel history or suspicious behavior when choosing whom to refer for additional scrutiny. Such referrals for extra scrutiny happen daily. Gil Kerlikowske, a former commissioner of Customs and Border Protection, said agents would put an added emphasis on a traveler’s country of origin when that nation was singled out as a national security threat.

The Department of Homeland Security did just that on Saturday, when it updated its National Terrorism Advisory System to warn of Iran’s ability to retaliate against the United States through terrorism or cyberattacks or violence by homegrown extremists.

The BBC has more:

Sepehr Ebrahimzadeh, a Seattle-based engineer, told BBC Persian he had waited about six hours to cross the border at Blaine, and was repeatedly questioned during that time.

A Canadian citizen with a US green card, he said he was trying to enter the US by land from British Columbia, Canada.

Mr Ebrahimzadeh said US Border Patrol guards had questioned him about his birthplace, his high school years in Iran, his own military service and his father’s, and about other relatives and his employment history.

He said he saw other Iranians next to him who had to wait hours and were questioned about their social media accounts.

It’s a bit like interrogating and hassling refugees from Hitler because hey, they’re German. Iranians who have gone to the trouble to emigrate seem unlikely to be huge fans of the regime.

US lawmakers expressed concern on Twitter about the reports.

Senator Elizabeth Warren, a leading contender in the Democratic presidential race, called the reports “deeply disturbing”.

“Iranian Americans have the same rights as all other U.S. citizens and should be treated with dignity and respect at our border – not bigoted, xenophobic scrutiny,” Ms Warren said on Twitter.

Washington state congresswoman Pramila Jayapal also said she was “deeply disturbed”.

We’ve been down this road before, and we didn’t cover ourselves with glory.