Investigators return to Boston bombing suspect's apartment

(CBS News) BOSTON - The investigation into the Boston Marathon bombings focused Sunday on the home of the older suspect, who died in a shootout, and on his widow as well.

Federal agents again searched the Cambridge apartment of bombing suspect Tamerlan Tsarnaev. There was no comment on what brought them back.

Sources have told CBS News that small amounts of bomb residue have already been found inside, appearing to corroborate the story that Dzhokhar Tsarnaev has given investigators. Dzhokhar Tsarnaev has admitted the bombs were made in his brother's apartment.

Tamerlan's 24-year-old widow Katherine Russell shared the small apartment with her husband and their three-year-old daughter. The focus on Russell is intensifying. A search of her laptop found al Qaeda's online magazine "Inspire," which offers bomb-making instructions. Investigators would like to know whether Russell or her husband was accessing that material.

The body of Tamerlan Tsarnaev remains at a Worcester funeral home. On Sunday, his uncle arrived to arrange for burial, but funeral director Peter Stefan says he has not yet found one cemetery willing to bury the older Tsarnaev.

As for the bombing victims, many are getting on with their lives. At Saturday night's Boston Bruins game, Jeff Bauman got a hero's welcome. Fans cheered the 27-year-old who lost both legs while watching at the finish line. When he woke up in his hospital bed, Bauman helped authorities identify suspect Tsarnaev.

In a statement Bauman said: "I want to thank everyone for their amazing support for me and all those injured and their families. I'm making great progress."

A fund to raise money for the injured has raised more than $28 million. On Monday, fund administrator Kenneth Feinberg will hold a town hall and meet with the victims.