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Boston Marathon bombing suspect Dzhokhar Tsarnaev remained in serious condition at a Boston hospital under heavy guard Sunday as investigators continued the long process of looking over motives, methods and possible links.

Tsarnaev, 19, who was taken into custody on Friday and whose older brother, Tamerlan, was killed in a shootout with police, will be questioned by a special team sent in by the FBI, Boston Police Commissioner Ed Davis told “Fox News Sunday.”

“He’s [Dzhokhar] in no condition to be interrogated at this point in time. He’s progressing, though, and we’re monitoring the situation carefully,” Davis said.

Massachusetts Gov. Deval Patrick said Saturday afternoon that Dzhokhar Tsarnaev was in serious but stable condition and was probably unable to communicate. Tsarnaev was at Boston’s Beth Israel Deaconess Medical Center, where 11 victims of the bombing were still being treated.