A second flight near London's Heathrow Airport has been targeted by someone shining a laser.
The British Airways service from Amsterdam was affected at 7.47pm on Monday when a beam was aimed at the aircraft as it headed in to land.
It comes nine days after a Virgin Atlantic flight to New York's JFK returned to Heathrow as a "precautionary measure" after a laser was shone at the cockpit.
Scotland Yard said the plane was not put in danger during Monday's incident and no arrests had been made.
British Airways would not confirm what had happened but said laser attacks are taken "extremely seriously".
The British Airline Pilots Association (Balpa) has repeated its calls for lasers to be classified as offensive weapons.
Balpa general secretary Jim McAuslan said: "Aircraft are attacked with lasers at an alarming rate and with lasers with ever-increasing strength.
"It is an incredibly dangerous thing to do.
"Shining a laser at an aircraft puts that aircraft, its crew and all the passengers on board at completely unnecessary risk.
"We repeat our call to the Government to classify lasers as offensive weapons which would give the police more power to arrest people for possessing them if they had no good reason to have them.
"This incident shows why this is becoming more and more urgent."
More than 8,998 laser incidents across the country were reported to the UK Civil Aviation Authority between 2009 and June 2015.