Bomb Suspect Is Charged and Will Be Tried in Civilian Court Eric Thayer for The New York Times People attending the funeral for Krystle Campbell at St. Joseph's Church in Medford, Mass., on Monday, comforted each other. BOSTON - The surviving suspect in the Boston Marathon bombings was charged Monday with "using a weapon of mass destruction" that resulted in three deaths, according to documents filed in federal court. The suspect, Dzhokhar Tsarnaev, was charged by federal prosectors as he lay in a bed at Beth Israel Deaconess Medical Center, officials said. In a criminal complaint unsealed Monday in United States District Court for the District of Massachusetts, Mr. Tsarnaev was charged with one count of "using and conspiring to use a weapon of mass destruction" against persons and property within the United States resulting in death, and one count of "malicious destruction of property by means of an explosive device resulting in death." If he is convicted, the charges could carry the death penalty. During the bedside arraignment, a magistrate judge advised Mr. Tsarnaev of his rights and the charges against him, according to court papers. The affidavit accompanying the complaint provides the fullest picture to date of the evidence collected so far by F.B.I. agents and police detectives, who have been working around the clock since two blasts seconds apart silenced the cheering crowds and wrought chaos along the race's route. The affidavit, sworn out by Daniel R. Genck, an F.B.I. special agent assigned to the Joint Terrorist Task Force in Boston, cites the surveillance video that helped identify the two suspects, and details their movements before the blasts, describing how and where they placed the backpacks that the complaint says contained bombs. It also describes Mr. Tsarnaev speaking on a cellphone, then apparently taking a photo with it. It said that the explosive devices - which it describes as "low-grade explosives that were housed in pressure cookers" that also contained "metallic BB's and nails" - were placed near metal barriers along Boylston Street, where hundreds of spectators were watching the marathon runners as they approached the finish line. In chilling detail, taken from surveillance video, the affidavit describes how a man it refers to as Bomber Two, which it identifies as Dzhokhar Tsarnaev, walks down Boylston Street toward the finish line with the thumb of his right hand hooked under the strap of his knapsack, and a cellphone in his left hand. "He then can be seen apparently slipping his knapsack onto the ground," the affidavit said. Video from the nearby Forum restaurant shows the bomber remaining in place, checking his cellphone, and even appearing to take a picture with it, the papers said. Then he appears to look at his phone, and appears to speak on it. "A few seconds after he finishes the call, the large crowd of people around him can be seen reacting to the first explosion," the court papers said. Virtually every head turns to the east (towards the finish line) and stares in that direction in apparent bewilderment and alarm. Bomber Two, virtually alone among the individuals in front of the restaurant, appears calm. He glances to the east and then calmly but rapidly begins moving to the west, away from the direction of the finish line. "He walks away without his knapsack, having left it on the ground where he had been standing," the court papers said. Approximately 10 seconds later, an explosion occurs in the location where Bomber Two had placed his knapsack. In the court papers, Agent Genck says that he compared the driver's license photo of Mr. Tsarnaev to the video images, and that he believes "based on their close physical resemblance, there is probable cause that they are one and the same person." He also compared the driver's license photo of the other bombing suspect, Mr. Tsarnaev's brother, Tamerlan, with the video and said they were one and the same person. The charges were announced one week after the 117th Boston Marathon began with a starter's gun and ended in two deadly bombings, shortly before a statewide moment of silence was planned for 2:50 p.m. to mark the moment that a pair of pressure-cooker bombs detonated. Richard A. Oppel Jr. reported from Boston, and Michael Cooper and William K. Rashbaum from New York. Jess Bidgood contributed reporting from Boston, and Peter Baker from Washington.