Authorities have launched a search across the Northeast for four Chinese nationals the FBI says could be potential terror suspects. Federal law enforcement officials say they got a tip yesterday about an unspecified threat against Boston, but they say they haven't confirmed anything. The threat prompted the governors of New Hampshire and Massachusetts to skip the inaugural activities in Washington and return to their states. However, both are downplaying the threat. New Hampshire Governor John Lynch says, "It does not appear that there is any cause for alarm." Emergency crews in the area say while they're not treating this as a full blown emergency, it will stay active "until this thing resolves itself."