Memorial service held for slain MIT officer; Boston investigation continues

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As the community prepares to say goodbye to a police officer killed in the line of duty last week, the investigation continues into the Boston Marathon bombings.

Thousands of Massachusetts Institute of Technology students, faculty and staff as well as law enforcement officials from across the nation are expected to attend a memorial service for fallen campus police officer Sean Collier.

MIT officials say they are expecting as many as 10,000 people at Wednesday's service at Briggs Field.

Authorities think the 27-year-old Collier was shot and killed by the Boston Marathon bombing suspects last Thursday.

Collier had worked for the MIT police for a little over a year, but already was well-respected by his colleagues and superiors and popular with students. He often went on hikes with the MIT student outing club.

Vice President Joe Biden, as well as MIT President L. Rafael Reif, police chief John DiFava and members of Collier's family are scheduled to speak.

Meantime, federal investigators are in Russia talking to the parents of the accused Boston bombers. In Washington, DC, some are complaining that the federal agencies investigating the bombing are not sharing information.

In Boston, Boylston Street reopened Wednesday morning with new pavement covering the area where the first bomb detonated.

The United States will release the body of slain suspect Tamerlan Tsarnaev, but his family is having trouble finding a place to bury him. They say the Boston mosque they attended refused to do the service.

In Makhachkala, Russia, Tsarnaev's mother was told she could see her son Dzhokhar, the second bombing suspect, who is now in fair condition at a Boston hospital.

"When she became increasingly devout, Tamerlan, the older brother gravitated towards her. And it's a very interesting question about what influence she had over Tamerlan," said Roger Cressey, NBC News terrorism analyst.

Back home, lawmakers got another classified briefing.

"The main question is the FBI's investigation going back to 2011 and why it was not followed up since then," said Rep. Peter King (R-NY).

"I'm very concerned that there still seems to be serious problems with sharing information," said Sen. Susan Collins (R-ME).

Investigators also want to talk with the wife of the older bombing suspect. She's with family in Rhode Island. So far, they've only been able to talk with her attorney.

On Capitol Hill, the secretary of homeland security explained why Tamerlan Tsarnaev's trip to Russia raised no red flags.

"The FBI text alert on him at that point was more than a year old and had expired," said Janet Napolitano, Homeland Security Secretary.