Security at Los Angeles International Airport (LAX) has increased in response to the terrorist attacks in London Thursday, July 7th, that killed more than 50 persons on three underground rail lines and a double-decker bus.

Airport police in coordination with the federal Transportation Security Administration (TSA), local law enforcement officials and air carriers have implemented a number of additional security measures in wake of the London attacks, LAX officials said.

Airport officials said additional security measures at the airport included increased presence of police at airport entrances and increased use of canine patrols in passenger terminals.

But other security measures will remain confidential, LAX officials said.

Unattended vehicles parked at the curb in front of airport terminal buildings will be immediately impounded and towed at the owner’s expense, LAX officials said.

LAX officials said airline operations at LAX were at normal operation following the London attacks and were expected to remain routine during the heightened security period.

LAX officials said flights serving the United Kingdom were not experiencing delays or cancellations as of early Thursday, July 7th.

LAX has nine daily nonstop flights to London-Heathrow Airport with four airlines offering direct service, including Virgin Atlantic Airways, United Airlines, American Airlines, Air New Zealand and British Airways.

Law enforcement presence at four City of Los Angeles-owned airports includes hundreds of uniformed and plainclothes officers from airport police, city police and numerous federal agencies, including TSA, Federal Bureau of Investigation, U.S. Air Marshals, U.S. Customs and Border Protection, as well as canine patrols and special operations units, city airport officials said.