Three additional suspects were taken into custody in the Boston Marathon bombing case, the Boston Police Department tells FoxNews.com. 

Police would not confirm when the suspects were taken into custody, and referred further questions to the FBI.

Prior to the latest development, authorities had named only brothers Tamerlan and Dzhokhar Tsarnaev as suspects in the April 15 bombing at the finish line of the world famous race.

Two of Dzhokhar Tsarnaev's UMass-Dartmouth roommates, Dias Kadyrbayev and Azamat Tazhayakov, are from Kazakhstan and faced an immigration hearing this morning, sources said. Sources told Fox News they face obstruction charges in connection with the bombing. The identity of the third suspect is unclear.  

Kadyrbayev and Tazhayakov are suspected of taking computers and other equipment from Dzhokhar Tsarnaev's apartment and trying to dispose of it after the bombings, sources told Fox News.

Police did not confirm the gender of the third suspect. More information was expected to be provided by the US Attorney's office later Wednesday.

Three people were killed and more than 200 injured when the pair allegedly set two bombs, at least one of which was made from a pressure cooker packed with explosives and shrapnel, amid the crowd. 

Tamerlan Tsarnaev died April 19, after a shootout hours after authorities showed the brothers on surveillance video and named them as suspects.  Dzhokhar Tsarnaev, 19, is in a prison hospital after being wounded in the shootout with police as he and his brother made their getaway attempt. He is charged with using a weapon of mass destruction to kill, a crime that carries a potential death sentence.

Authorities have searched the Rhode Island home of the parents of Katherine Russell, Tamerlan Tsarnaev's widow.

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