Details of Boston Marathon bombing suspect Dzhokhar Tsarnaev's condition were released Saturday. The 19-year-old suspect was in serious condition at Beth Israel Deaconess Medical Center in Boston Saturday morning after his arrest in Watertown, Mass., Friday night, according to Reuters.

A Beth Israel Deaconess representative, Kelly Lawman, said the FBI would provide updates on his condition, Reuters reported.

Tsarnaev reportedly lost a fair amount of blood during his battles with police Friday.

Blood stains are what alerted Watertown resident David Hanneberry that the suspect was taking cover in his backyard. And it was lucky for Tsarnaev that they did because he bled for hours from neck and leg wounds that could have been fatal had he not been found, CBS News reported, adding that Tsarnaev may have been bleeding as long as 20 hours before being discovered.

"This is a guy who was very weak and at this point and probably -- had he not been discovered -- he might not have lived," CBS News senior correspondent John Miller said.

Miller said Tsarnaev's injuries were a result of a shootout between authorities and the 19-year-old Russian native early Friday.

"[It was] a fierce gun battle with police after the carjacking and the car chase, at which one point they were apparently exchanging gun fire, but also throwing homemade grenades and one large satchel bomb at police officers," Miller said. "So he had been bleeding for a long time."

Dzhokhar Tsarnaev's brother and co-suspect in the Boston Marathon bombings April 15, Tamerlan Tsarnaev, was pronounced dead after the shootout with police early Friday. Following his death, an extremely graphic photograph of his body surfaced online, showing extensive injuries.