Special Coverage

New immigrants will be the main driver of population growth in the U.S. by as early as 2027, according to new Census Bureau projections.

This would be the first time in almost two centuries that new births will not be the largest source of U.S. population growth.

The Census Bureau says its projections show a combination of declining fertility rates, aging baby boomers and ongoing immigration to the United States.

With its glittering spire firmly attached, the new World Trade Center became the tallest building in the Western Hemisphere on Friday morning. The building at One World Trade Center now stands at 1,776 feet.

"It will give a tremendous indication to people around the entire region, and the world, that we're back and better than ever," Steven Plate, the head of construction at the World Trade Center, said last week when the spire was hauled to the top of the building.

A Pentagon survey estimating sexual assaults in the military finds that cases have spiked by a third since 2010.

USA Today obtained a summary of the report, which is due out later this week. The newspaper reports that in 2010, 19,300 service members were believed to be victims of sexual assault; that number went up to 26,000 in 2012.

The paper adds:

The man known as Misha who relatives of the Boston Marathon bombing suspects have alleged may have turned the elder Tsarnaev brother toward a radical form of Islam says he did no such thing and would have tried to stop the attack if he had known about it.

"I wasn't his teacher," Mikhail Allakhverdov (Misha) said Sunday of Tamerlan Tsarnaev. "If I had been his teacher, I would have made sure he never did anything like this."

Dzhokhar Tsarnaev, the surviving suspect in the April 15 Boston Marathon bombings and the crimes that followed, has been moved out of Boston's Beth Israel Deaconess Medical Center "and is now confined at the Bureau of Prisons facility FMC Devens at Ft. Devens, Mass.," U.S. Marshals Service spokesman Drew Wade said in a statement emailed to reporters Friday morning.

As investigators look into the Boston Marathon bombings, one crucial question is whether the suspects, brothers Tamerlan and Dzhokhar Tsarnaev, acted alone or had help. The clues might be found in the bombs used.

From what is now known, it appears the brothers assembled a whole arsenal of explosives. Watertown Police Chief Edward Deveau told CNN last weekend that the suspects had at least six bombs, including the two used in the attack and one thrown at police during a shootout.

(We most recently updated this post at 11:10 p.m. ET on Friday. See this note about how we cover news such as this. For our running post about developments on Saturday, go here.)

Updated 1:50 p.m. ET: (Correcting that brothers shared an apartment in Cambridge, not Watertown.)

The suspects in Monday's deadly Boston Marathon explosions and the Thursday night murder of a police officer at the Massachusetts Institute of Technology are two brothers from a former Soviet republic who were in the United States legally for years, and lived together in a Cambridge, Mass., apartment.