Mrs Merkel is on the campaign trail and posed for a selfie yesterday

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Leading figures are calling for Chancellor Angela Merkel to introduce facial recognition software to spot potential threats in transport hubs - including airports and train stations.

In an interview Interior Minister Thomas de Maiziere said politicians want to see the introduction of the new measures as soon as possible.

He said: "I would like to use this kind of facial recognition technology in video cameras at airports and train stations.

"Then, if a suspect appears and is recognised, it will show up in the system."