Flights Mysteriously Diverted

On Sunday, the tenth anniversary of the attacks on the World Trade Center, two airline flights were escorted by military jets to their destinations due to strange behavior by passengers. On one plane three passengers and on the other plane two passengers were making repeated trips to the restrooms and spending an inordinate amount of time there. Some passengers thought one group was communicating via hand signals. These people were removed in handcuffs but later released. There has been no follow up as to who they were and what they were doing. No photographs or names were released in the initial reports. Were they terrorists testing the response of authorities? Were they government agents? I would be very concerned if it is the former.