United Airlines flight 934 landed at Logan International Airport just before 3 a.m. The three unidentified Pakistani men were taken into custody and questioned after other passengers complained that they were moving between different sections of the cabin, an FBI spokeswoman said.
"Some of the individuals were in first class and another was in coach," spokeswoman Gail Marcinkiewicz added.
The three passengers, who were said to be traveling for business, were cleared to continue on to London's Heathrow Airport after police searched the aircraft and found nothing suspicious according to airport spokesman Phil Orlandella.
Flight 934 departed Logan at 11:47 a.m. and the three Pakistani passenger were placed on another flight, said Jeff Green, a spokesman for United Airlines.