Two foreign nationals — who are believed to be associates of the alleged Boston Marathon bombers — were arrested Saturday on immigration violations, authorities said. The men, identified by neighbors as 19-year-olds from Kazakhstan, drove around in a black BMW with the mock license plate, “TERROISTA #1.” The pair was hauled out of their New Bedford apartment in handcuffs about 3:50 p.m. The raid was carried out by Immigration and Customs Enforcement agents, a spokesman told the Daily News.