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Explosions at the Boston Marathon, potentially ricin-laced letters intercepted en route to the White House and Sen. Roger Wicker, and an explosion at a fertilizer plant in Texas have each prompted investigations. In each case, authorities sift through evidence to construct a timeline of events.

After the Sandy Hook shooting, Gov. Dannel Malloy signed into law some of the strictest gun controls in the country. He also urged the passage of new federal restrictions. Melissa Block talks with Malloy about his reaction to the Senate's failure to pass legislation this week.

The FBI is interested in two men seen in videos and photographs at Monday's Boston Marathon before two bombs went off. Investigators released photographs and asked the public to help identify the men on Thursday. Robert Siegel talks to Dina Temple-Raston has the latest.

Bostonians mourned the victims of the Boston Marathon bombings on Thursday.

President Obama attended an interfaith service in Boston honoring the victims and survivors of the marathon bombing.

Robert Siegel talks to Robert McFadden, senior vice president of The Soufan Group and a 30-year veteran of federal law enforcement, about the latest news in the Boston Marathon bombing investigation.

The FBI held a press conference on Thursday about the latest news in the Boston Marathon bombing investigation. Robert Siegel talks to Tom Gjelten for more.

Author Dennis Lehane talks with Fresh Air's Terry Gross about his New York Times op-ed, "Messing with the Wrong City," which expressed his love for his hometown.

Charles Sennott, vice president, executive editor and co-founder of GlobalPost, talks with Fresh Air's Terry Gross about the ongoing manhunt in Boston. Seth Mnookin, a contributing editor at Vanity Fair, describes live-tweeting the events at MIT.

Joe Berti traveled to Boston for that city's marathon and crossed the finish line seconds before the first bomb exploded. He was OK and returned home to Texas — where he was close enough to a fertilizer plant to see it explode Wednesday night.