Germany's federal police said on Wednesday they were interrogating a suspect after a security breach at Frankfurt airport prompted a partial evacuation and halted flights.
Part of the terminal at Europe's fourth largest airport had to be cleared of passengers on Wednesday morning after a person passed into the departure area without completing the security check.
Police did not find any suspicious items in the departure area following the evacuation, a spokeswoman for the federal force told Reuters. She could not provide any further details on the suspect.
All passengers had been cleared from the Terminal 1 departure hall earlier.
"The main aim of the evacuation is to ensure that the terminal is secure," a police spokesman said at the time.
In a similar incident, a Spanish man was arrested at Cologne-Bonn airport in May after breaching security, leading to flight delays.