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Boston bombing suspect Dzhokhar Tsarnaev has not yet been questioned — but officials' decision not to read him his Miranda rights before interrogation is the subject of much debate.

Keep your eye on the sky Sunday evening; the Lyrid meteor shower is expected to peak. It's the first meteor shower of the spring season.

The Lyrid shower is caused by Earth passing through the orbit of a comet known as Thatcher, though the comet itself hasn't been seen since 1861. Dust particles from the comet will be seen as flashes of light as they burn up in our atmosphere.

The London Marathon observed 30 seconds of silence before the race got underway Sunday, in a show of solidarity with the victims of Monday's attack at the Boston Marathon. Many runners and spectators wore black ribbons to honor the three people killed and the more than 170 injured in two bombings.

(Most recent update: 4:20 p.m. ET)

Investigators are still waiting to interview Boston Marathon bombing suspect Dzhokhar Tsarnaev, whose wounds reportedly include injuries to his neck and leg. An official tells CNN that Tsarnaev has been "intubated and sedated," rendering him unable to speak with them.

As reporters in Jerusalem a decade ago, my wife, Jennifer Griffin, and I covered more than 100 suicide bombings over several blood-soaked years. The carnage defined our lives as we raced to blast sites, interviewed battered survivors in emergency rooms and tracked down the extremists behind the deadly attacks.

At an 11-nation meeting in Turkey this weekend, there was one thing the United States, European and Arab states could agree on: With more than 70,000 killed and millions of people displaced, the Syrian crisis, as Secretary of State John Kerry says, is "horrific."

In response, the Obama administration is doubling its non-lethal assistance to the Syrian opposition, Kerry announced at the meeting.

On Tuesday, Oklahoma and Texas will face off in the U.S. Supreme Court. The winner gets water. And this is not a game.

The court will hear oral arguments in the case of Tarrant Regional Water District v. Herrmann, et al. The case pits Oklahoma against Texas over rights to water from the river that forms part of the border between them. Depending on how the court decides, it could impact interstate water-sharing agreements across the country.

Keeping Up With Texas

NPR's Daniel Zwerdling reports on what's known about the two brothers suspected in the Boston Marathon bombing, Dzhokhar and Tamerlan Tsarnaev.

Transcript

JACKI LYDEN, HOST:

With the manhunt now over, officials are thinking about the next steps: interrogation and prosecution. And NPR's counterterrorism correspondent Dina Temple-Raston is here with the latest on that. Dina, thanks for coming in.

DINA TEMPLE-RASTON, BYLINE: You're welcome.

LYDEN: Dina, so the Department of Justice has announced that they aren't going to be reading Dzhokhar Tsarnaev his rights right away. Can you tell us more about that?