The site you mentioned from Boston just posted this:

According to NBC, a jet has crashed in western Pennsylvania. Officials are asking everyone on the East Coast not to use cell phones. All federal buildings in Massachusetts have been closed, non-essential state employees have been sent home, and there is extra security at the State House. All high-rise buildings in Boston are being evacuated, and acting Governor Jane Swift is going to hold a press conference at 12:30 p.m.