Diverted flights of U.S. Security

Delta Flight 1706 Detroit San Diego landed in Albuquerque, New Mexico, due to a possible security threat.NEW: "Disturber" forces the Continental flight diversionNEW: Houston flight in Chicago dropped the man off the coast of St. LouisNEW: police dogs find nothing on the attendant of flightFlight diversion Delta finds suspicious note in the toilet of the Delta Flight

(CNN) - security concerns forced two U.S. passenger flights to be diverted Sunday, but the two aircraft landed safely and ends by flew to their final destination.

A Continental flight to Chicago of Houston made a unexpected stop in St. Louis because of a "disruptive behaviour", a spokesman for the St. Louis Airport, said Sunday.

The man tried to reach the door of output during the flight, but was arrested by flight attendant, said spokesman Jeff Lea.

The aircraft landed at St. Louis and human was removed from the aircraft for interrogation by airport police and federal authorities, he said.

Continental flight 546 finally landed in Chicago Sunday afternoon at a late hour.

A Delta flight was hijacked Sunday after flight attendant found a suspicious note in a toilet, the Transportation Security Administration official told CNN.

Detroit led San Diego flight was diverted to Albuquerque, New Mexico, the FBI said, adding that he has been informed of "the potential threat of security" in the aircraft. 1706 Flight arrives in Albuquerque shortly before 10 pm (12 pm EST) and agents were on the scene to investigate, the Office of the FBI in Albuquerque said.

A spokesman for the International Sunport de Albuquerque airport said passenger disembarked and were "being checked."

TSA spokeswoman Kristin Lee said the flight landed without incident and that all passengers disembarked safely.

"Passengers and carry-ons were cleared by a dog team, and the aircraft was swept the negative conclusions," said a statement by TSA.CNN Stephanie Gallmann and Mike M. Ahlers has contributed to this report.