Fighter jets escorted a diverted London-to-Washington, D.C., flight to Boston's Logan airport Wednesday after a distraught passenger pulled out a screw driver, matches, Vaseline and a note referencing al-Qaida, an airport spokesman said. United Flight 923 from London's Heathrow Airport to Dulles landed safely, Logan airport spokesman Phil Orlandella said. UAL Corp. spokesman Brandon Borrman said a female passenger was spotted engaging in some "suspicious" activity, but he could not immediately say what the activity was. State Police and federal agencies took control of the plane after it landed. Orlandella said the passengers' carry-on luggage was being checked.