651 pages of formerly confidential files obtained by a Boston newspaper through the Freedom of Information Act are shedding more light on one of the marathon bombers.

FOX's Bill Marcus has more:

Immigration records obtained by the Boston Globe show that three months before he exploded the bombs that killed three and injured 260 Tamerlan Tsarnaev passed his citizenship test.

He also swore allegiance to America denying any ties to terrorism. The redacted records show Tamerlan's application was delayed, but he also wanted to change his name to that of an Islamic scholar, something the Globe says should have sparked an investigation.

Homeland Security officials in a statement saying they found no errors in their processing.

In Boston, Bill Marcus, FOX News.