NYT:
The agents approached the mayor on the street and asked his security detail to step away, one of the people said. They climbed into his S.U.V. with him and, pursuant to a court-authorized warrant, took his devices, the person said.
...
Spokesmen for Mr. Adams and his campaign did not immediately comment.
...
The fund-raiser, a 25-year-old former intern named Brianna Suggs, has not spoken publicly since the raid.
(Looks like this part of the story has been confirmed, but not yet fully explored.)