Britain has raised its terror alert to its highest level and security is tighter at airports around the world Sunday including Pearson International after a flaming car slammed into the main terminal at Glasgow Airport.
The burning SUV barreled through a security barrier Saturday afternoon before crashing into the main terminal shattering the glass doors just metres from the check-in-counters, in what appears to be the third attempted terror attack on Britain in two days.
Five people, one of them reportedly a woman, are in police custody. The latest was arrested in Liverpool Sunday morning. One of the men who had been in the burning SUV is in critical condition under guard in hospital. Investigators have linked the attack to two car bombs found in London on Friday.
"One has to conclude ... these are linked," Dame Pauline Neville-Jones, former head of Britain's joint intelligence committee said. "This is a very young government, and we may yet see further attacks."
Extra police officers are on the streets of London and hundreds are monitoring a concert at Wembley Stadium to mark the 10th anniversary of Princess Diana's death.
Meanwhile, some airports in the U.S. like New York's Laguardia and LAX even have armed soldiers patrolling the grounds and helicopters keeping watch from the air.