Robel Phillipos, a U.S. citizen, was also arrested on May 1. He has been charged with lying to federal agents about the bombing, according to court papers. 
Phillipos, Tazhayakov and Kadyrbayev are accused of removing items from Tsarnaev's dorm room after the April 15 bombings. The items they took included a backpack containing fireworks that had been "opened and emptied of powder," according to the affidavit. 
Kadybayev, left, poses with Dzhokhar Tsamaev in a picture taken from the social media site VK.com. 
The FBI released photos and video on April 18 of two men identified as Suspect 1 and Suspect 2 in the deadly bombings at the Boston Marathon. They were later identified as Dzhokhar Tsarnaev, 19, and his brother Tamerlan Tsarnaev, 26. 
Authorities say Dzhokhar Tsarnaev, identified as Suspect 2, was captured in a Boston suburb on April 19 after a manhunt that shut down the city. 
Police say the dead suspect, Tamerlan Tsarnaev, is the man the FBI identified as Suspect 1. He was killed during the shootout with police in Watertown, Massachusetts, early April 19. He is pictured here at the 2010 New England Golden Gloves. 
Boston Police released surveillance images of Dzhokhar Tsarnaev at a convenience store on April 19. 
The FBI tweeted this photo on April 19 and urged Watertown residents to stay indoors as they searched for the second suspect. 
The FBI released photos and video on April 18 of two men it called suspects in the deadly bombings and pleaded for public help in identifying them. The men were photographed walking together near the finish line. 
A man identified as Suspect 2 appeared in this photograph by bystander David Green, who took the photo after completing the Boston Marathon. Green submitted the photo to the FBI, he told Piers Morgan in an interview. 
The man identified as Suspect 2 appears in a tighter crop of David Green's photo. 
Authorities later identified Suspect 1 as Tamerlan Tsarnaev. 
Suspect 2 was identified as Dzhokhar Tsarnaev. 
Suspect 1 walks through the crowd. 
Suspect 1 walks through the crowd. 
Suspect 1 walks through the crowd. 
Both suspects are seen walking through the crowd. 
Suspect 2 walks through the crowd. 
Suspect 2 walks through the crowd. 
A photo released by the FBI highlights Suspect 2. 
A photo released by the FBI highlights Suspect 2. - NEW: Bombs built in older brother's apartment, official says
- NEW: Brothers were planning July 4 attack but moved up timetable, source says
- Friend turned over Dzhokhar Tsarnaev's computer, attorney says
- Body of Tamerlan Tsarnaev has been claimed, picked up by funeral home
(CNN) -- The bombs used in the Boston Marathon attack were built in the apartment that suspect Tamerlan Tsarnaev shared with his wife and child, a U.S. law enforcement official with first-hand knowledge of the investigation told CNN on Thursday. The official was not authorized to release the information.
Katherine Russell, Tsarnaev's widow, has remained largely out of view inside her parents' North Kingstown home since her husband's death.
According to her attorney, Amato DeLuca, the 24-year-old widow knew nothing of plans to bomb the race, and reports of her husband's involvement came as an "absolute shock" to Russell and her family.
Tsarnaev and his younger brother, Dzhokhar, initially planned to carry out an attack on July 4, but their bombs were ready earlier than they expected and they decided to move up the date, a U.S. law enforcement official told CNN on Thursday.
It is unclear which specific event would have been targeted but one of the biggest July Fourth celebrations in the country is held in Boston. The annual Boston Pops Fireworks Spectacular hosts 500,000 spectators, according to the event's website. It is televised live nationally on PBS.
The revelation comes the same day the body of Tamerlan Tsarnaev was claimed and later was picked up by a funeral home, according to Terrel Harris, spokesman for the Massachusetts office of the chief medical examiner.
Harris declined to release details as to who claimed the body or which funeral home picked it up.
Tsarnaev's cause of death will not be released until the death certificate is filed with the Boston city clerk, he said. The earliest that's expected to happen is Friday morning, Harris said.
One item that may yield some clues into the bombings case is now in the hands of federal officials.
The FBI has a laptop belonging to Dzhokhar Tsarnaev, Tamerlan's younger brother, two federal law enforcement officials told CNN.
The computer was turned over to investigators by one of his friends accused of obstructing justice.
A lawyer for Dias Kadyrbayev tells CNN that his client "turned over the laptop to the FBI." He didn't say when the laptop was turned over.
A law enforcement source confirmed the attorney's account.
Three people died and more than 260 were wounded when two explosive devices fashioned from pressure cookers and other materials exploded in separate locations near the finish line of the Boston Marathon on April 15.
Four people have been charged in connection with the bombing, including Dzhokhar Tsarnaev, who is accused of carrying out the attack along with his brother, Tamerlan, 26. The older brother died April 19 after a firefight with police, hours after authorities released images of the suspected bombers.
Azamat Tazhayakov and Kadyrbayev were charged Wednesday with conspiring to discard potentially incriminating items from Dzhokhar's dorm room, including empty fireworks containers, while Robel Phillipos was charged with making false statements to investigators.
The Kazakhstan Foreign Ministry said Thursday it was offering consular services to Kadyrbayev and Tazhayakov, who are citizens of that country and are in the United States on student visas.
"We would like to emphasize that our citizens did not receive charges of involvement in the organization of the Boston Marathon bombings. They were charged with destroying evidence," the ministry said in a statement.
Dzhokhar, who suffered gunshot wounds to the head, neck, legs and hands, is being held at a federal Bureau of Prisons medical facility in Devens, Massachusetts. He has been charged with using a weapon of mass destruction and could face the death penalty if convicted.
Authorities have said they believe the brothers acted alone, but are investigating whether they could have learned from or been aided by terror groups, including groups overseas.
Of particular interest has been Tamerlan Tsarnaev's 2012 trip to the semi-autonomous Russian republic of Dagestan, home to numerous Islamic militant groups that have warred against Moscow's rule.
Russian authorities asked U.S. officials to investigate Tamerlan some months before the trip, saying they believed he was becoming increasingly involved with radical Islam. The FBI investigated, but found no evidence of extremist activity and closed the case.
U.S. officials learned after the bombings that Russian officials had intercepted a 2011 phone call between the suspect's mother, living in Dagestan, and one of her sons in which they reportedly had a vague conversation about jihad, a law enforcement official told CNN earlier.
Some lawmakers, particularly Republicans, have been critical of how law enforcement officials, intelligence agencies and the administration of President Barack Obama handled the Russian tip.
While Tamerlan Tsarnaev and his mother were added to a terror database following the FBI investigation, Tamerlan was allowed to make his Russian trip in 2012 and return six months later.
CNN's Marina Carver contributed to this report.
From left, Azamat Tazhayakov and Dias Kadyrbayev went with Boston bombing suspect Dzhokhar Tsarnaev to Times Square in this photo taken from the social media site VK.com. Tazhayakov and Kadyrbayev were 
