The German national team has tweeted a picture of head coach Joachim Loew with the pilots of the team's flight back to Germany - who are given a "golden opportunity" to hold the World Cup trophy.
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Police have stepped up patrols after the suspected targeted attacks.
The royal couple will carry out their first official engagements as husband and wife on Tuesday.
Flights from UK airports were an average of 15 minutes late in 2017.