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The bombs exploded 12 seconds apart near the marathon's finish line on Boylston Street.
According to Richard DesLauriers, the special agent in charge of the FBI's Boston office, the bombs contained BB-like pellets and nails.
The bombs were contained in pressure cookers, hidden inside backpacks, according to the FBI.
The Department of Homeland Security issued a warning in 2004 about pressure cooker bombs. Instructions for making this type of explosive are widely available on the Internet.
For months, the pictures Murphy took of Tsarnaev's capture were kept out of the public light since they were the property of the state police.
Of course I found out from Twitter; everybody did, it seemed. After reading the news in my feed, my wife and I turned on the TV to see what was going on, but after a few minutes of watching television reporters spout empty speculation and unverified information, we turned it off again.
The Boston Globe temporarily converting its homepage to a live blog that pulled in Tweets from Boston authorities, news outlets, and ordinary citizens.
“We tried to put out as much information as we possibly could without jeopardizing the investigation,” said Cheryl Fiandaca, bureau chief for public information at the Boston Police Department. Fiandaca was previously a freelance reporter for WCVB-TV in Boston.
Besides posting updates, the Boston Police Department also corrected false claims that were spreading across social networks, and warned news media not to compromise safety or police tactics by broadcasting live video of officers approaching search locations