In Germany, an alert has been issued for Munich airport after an intruder is said to have gained access to the secure area.
It is said that around 200 flights had to be cancelled and two terminals evacuated at Munich airport.
The steps were taken after an unidentified person entered a secure area, police and the airport said.
The person is said to be a woman, who made it into a secure area of Terminal II.
She got there without being checked and then disappeared without trace despite an extensive search, police said.
Several thousand people at the airport on a busy weekend of holiday departures had to be evacuated.
Sixty flights were also delayed.>