British police have found a suicide note in connection with the two men who rammed an explosives-laden vehicle into Glasgow's airport, sources close to the investigation told CNN.Investigators believe the two men had earlier driven for six hours from central London where on Friday they parked two cars packed with explosives but which failed to detonate.
| The letter's contents had all the hallmarks that the men intended to detonate the sport-utility vehicle while they were inside, |
Investigators also believe the plot may have been hatched before the suspects arrived in Britain in recent years.
U.S. officials told CNN that some of the suspects were recruited by al Qaeda while they were living in the Middle East.
A British Anglican cleric working in Baghdad said a man he met in Jordan issued a disturbing threat that is now feared to be a dire portent in the aftermath of the failed British bombing attacks.
"Those who cure you will kill you," the man told Canon Andrew White, who spoke to CNN on Wednesday, now taken as a reference to the terror plot in Britain.
In his first question-and-answer session since he took office, British Prime Minister Gordon Brown Wednesday vowed to take measures to increase security in the wake of the attempted bombings, which happened days after he became prime minister.
In addition to expanding the watch list of potential terrorists, Brown said background checks will be stepped up and British authorities will keep a closer eye on how it recruits doctors from other countries.
"I've asked Lord (Alan) West, the new terrorism minister, to conduct an immediate review as to what arrangements we must make in relation to recruitment to the NHS (National Health Services) recruitment because of what we know has happened over the last few days," Brown told the House of Commons.