Report: Brothers originally planned for a July 4 attack

Tsarnaev Brothers at the Boston Marathon

By CNN Staff

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.

Tamerlan and Dzhokhar Tsarnaev 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.

The body of  suspect Tamerlan Tsarnaev was claimed Thursday afternoon, and 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.”

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.

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.

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