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3 more detained in Boston attack

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(CNN) — Three additional suspects in the Boston Marathon bombing have been taken into custody, Boston police said Wednesday.

A Department of Homeland security source with first-hand knowledge of the investigation, said two of them are students from New Bedford, Massachusetts. They have been arrested on charges of making false statements to investigators and conspiracy to obstruct justice.

The news about the additional suspects was released by Boston Police on twitter Wednesday morning shortly after 9 a.m.

About 30 minutes after issuing that initial update, BPD added this:

Alan Dershowitz, a prominent defense attorney and Harvard law professor, said the new charges don’t appear to be related to the bombing itself.

“If they knew about the bombing, if they were involved in the bombing, the charges would be conspiracy to do the acts for which the other man has already been charged,” Dershowitz told CNN. “So it sounds like at this point in time the only evidence they have is actions that took place after the bombing.”

The students are originally from Kazakhstan and were already in custody on immigration charges, according to another source with knowledge of the immigration case. The third is a U.S. citizen, the federal law enforcement source said.

Federal agents already have accused two brothers, Tamerlan and Dzhokhar Tsarnaev, of carrying out the attack. Tamerlan died after a shootout with police, and Dzhokhar is in custody.

The news follows more than two weeks of frantic investigation after the April 15 attack. Two bombs exploded in the crowd gathered near the finish line of the marathon, killing three people and wounding more than 260.

Federal agents already have accused two brothers, Tamerlan and Dzhokhar Tsarnaev, of carrying out the attack. Tamerlan died after a shootout with police, and Dzhokhar is in custody.

The students who now face charges went to college with Dzhokhar Tsarnaev, the source familiar with the immigration case said.

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