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Law enforcement officials have been given high marks for their response to the bombings at the Boston Marathon. But at the same time, questions are being raised about the coordination among federal agencies handling intelligence about the suspects in the months before the attack.

A pro-gun control superPAC started by former Rep. Gabrielle Giffords and her husband, onetime astronaut Mark Kelly, launched radio ads against Republican Sens. Mitch McConnell and Kelly Ayotte for voting against bipartisan background check legislation.

The defense secretary said the U.S. has to be "very careful" before drawing conclusions about Syria. The U.S. has said the use of chemical weapons is a "red line" in the conflict.

The Associated Press, NPR and the BBC have all had their Twitter accounts hijacked in recent weeks. Hacks of high-profile accounts have real-world consequences, and the security at Twitter is coming under increased scrutiny.

The investigation into the Boston Marathon bombing continues. Investigators have spoken with the parents of the suspects in Russia. Audie Cornish talks to Dina Temple-Raston about the latest developments.

When gut microbes break down certain foods like red meat and eggs, they produce a compound tied to risks for heart attack, stroke and death, a study found. The research could lead to new ways to prevent heart disease by shifting the mix of gut bacteria.

For years Ford was an also-ran in China, but it has ambitious plans to change that. Last year, sales in China were up more than 30 percent, and the Ford Focus was the country's best-selling car.

The U.S. Senate seems ready to let states collect sales tax from more online retailers. Support for the measure has increased as businesses have converged their online and offline sales. "We're looking for consistency" in how taxes are collected, says the owner of a St. Louis pet store chain.

When Superstorm Sandy flooded lower Manhattan last year, thousands of lab animals drowned and many scientists lost months or even years of work. The specialty animals can be very difficult to replace, but researchers say the loss of animal life is emotionally devastating and difficult to get over.

The government is about to change the way it accounts for the economic value of music and movies.