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Security officials in the United States and United Kingdom responded swiftly after an attack at Glasgow International Airport in which two individuals crashed a bomb-laden vehicle into an airport entrance.
In the wake of the airport incident in Scotland, British Airways P.L.C. announced additional security measures and called for people to avoid trying to reach airport terminals by car.
At Heathrow, the United Kingdom's busiest airport, additional security personnel and restrictions were put in place.
In the United States on the day of the attack, airport authorities increased the number of uniformed and plain-clothes officers to guard Chicago's O'Hare International and Midway airports. They also conducted random car checks and patrolled with police dogs.
In Washington, security workers were on the lookout for cars near Washington Mall rigged with explosives.
On July 3, the U.S. Transportation Security Administration deployed specialized units of bomb-detecting dogs, air marshals, transportation inspectors and "behavior detection officers" to mass transit areas in Boston, Chicago, Houston, Los Angeles, New York, Philadelphia, San Francisco and Washington.
The squads, dubbed Visual Intermodal Protection and Response teams, are deployed frequently to serve as a "visual deterrent" in large, public areas, a TSA spokeswoman said.
TSA has sent VIPR teams out 84 times in the past 18 months, she added.
"Frankly because it's July 4, we'd be doing it anyway," the TSA spokeswoman said. Because of the recent attack in Scotland, the agency has simply "done more of it" by increasing the operation's scope.