Boston Marathon bombings: The early thinking is that suspects were working on their own

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As investigators learn more about the surviving suspect in the Boston Marathon bombings and what Dzhokhar Tsarnaev and his brother Tamerlan allegedly did, the initial theory is that "these two young men were working on their own," NPR's Dina Temple-Raston said Tuesday on Morning Edition.

Authorities continue to question 19-year-old Dzhokhar, who remains hospitalized in serious condition. He's being treated at a Boston hospital for a variety of injuries he sustained during gun battles with police on Friday. It's also possible he tried to kill himself before he was captured Friday evening in the Boston suburb of Watertown, Mass.

Tamerlan, 26, died of injuries he sustained early Friday.

RELATED: Boston Marathon bombings: Suspect charged with conspiring to use a WMD (PDF, Update)

Investigators say they are hearing from Dzhokhar through notes he's writing in response to questions. Other than one comment from the magistrate who presided at his hospital bed arraignment Monday, there's been no indication that Dzhokhar is able to speak more than a word or two at a time. The magistrate reported that Dzhokhar said "no" when asked if he could afford a lawyer.

According to law enforcement sources Dina has spoken with, the information they've gotten from Dzhokhar leads them to suspect — so far — that Tamerlan was the "driving force" behind the bombings at the marathon (which killed three people and wounded more than 200).

The information Dzhokhar has been giving to investigators, Dina added, has them theorizing that the attack was "in a sense a homegrown plot with a little bit of an international flavor." Tamerlan, who reportedly had grown increasingly interested in an extremist form of Islam in recent years, traveled to Russia at least once. The family has Chechen roots.

CNN says investigators also believe the brothers were influenced by things they read on the Internet, and may have learned about bomb-making there as well.

An important reminder: The investigation is still in its early stages. Authorities will uncover much more evidence. The picture of what led the brothers to allegedly plant bombs at the marathon and then, allegedly, kill an MIT police officer and engage in a harrowing gun battle with authorities, could change substantially.

We'll be following Tuesday's developments and will update as news comes in.

Meanwhile, here are some of the morning's related headlines:

If Convicted, Tsarnaev Could Face Death Penalty. (The Washington Post)

"Bedside Transcript Of Boston Bombing Suspect Hearing." (The Boston Globe)

"Officials Say They Had No Authority To Watch Older Suspect." (The New York Times, which limits the number of stories that can be read for free.)

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