TORONTO — Holiday travel is being impacted on both sides of the pond. Fog is affecting travellers in London U.K., while in Los Angeles, flights are being delayed after three incidents of unattended luggage at different terminals at LAX.

Dense fog in the greater London region has caused delays to holiday travellers at several U.K. airports.

Officials said Thursday there were significant fog-related delays at Heathrow, Gatwick and London City airports. British Airways advised travellers to check their flight status online before heading to the airport.

The company said air traffic controllers had to allow greater space between planes because of the low visibility, leading to a reduced number of takeoffs and landings per hour.

The fog cleared up by late morning but officials warned that some delays would continue throughout the day.

Meanwhile, passengers are being warned of delays out of Los Angeles International Airport after incidents involving bags at three different terminals.

Airport spokeswoman Katherine Alvarado says the first involved a suspicious article found Wednesday morning in a baggage-screening room in Terminal 6. She says it has been cleared.

Alvarado says the Los Angeles Police Department bomb squad is investigating two unattended bags. One is under an outdoor bridge in Terminal 7 and the other is in a men’s restroom in Terminal 5.

She says an unknown number of flight delays have resulted and had no further information. She didn’t know whether any terminals had been temporarily evacuated.