Dias Kadyrbayev and Azamat Tazhayakov were identified as the two friends who have been held in Boston jail since April 20 following the questions over the license plates. After that, they remained in custody over immigration issues as they are Kazakh nationals whose academic visas had expired.
CNN has since identified Kadyrbayev and Tazhayakov as two of the three friends that were arrested today.
The third person in custody on Wednesday is believed to be an American citizen.