The bombings as well as subsequent reports that someone tried to mail the deadly poison ricin to U.S. President Barack Obama - the second report of such a letter in two days - have created a climate of uncertainty in the country. Nerves were jolted further by an inaccurate report on cable news network CNN that a bombing suspect had been arrested.
Shortly after CNN retracted its report of an arrest in the case, security officials at Boston's federal courthouse ordered staff, media and attorneys to evacuate due to a security scare and move at least 100 yards (91.4 meters) away, according to a Reuters reporter on the scene.
Bomb-sniffing dogs, fire engines and heavily armed and helmeted police arrived at the courthouse, which was reopened to employees an hour later.
In Washington, authorities were investigating a letter addressed to the president after the contents preliminarily tested positive for the ricin. Authorities had intercepted a letter sent to Republican Senator Roger Wicker of Mississippi on Tuesday that also preliminarily tested positive for ricin.
The FBI said there was no indication of a connection to the Boston bomb attacks, but they reminded Americans of anthrax mail attacks the country in the wake of the September 11 attacks 12 years ago.
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