Authorities in Hannover, Germany warned residents to not attempt to wave at President Barack Obama when he visits later this month.
The president will join German Chancellor Angela Merkel to open Hannover Messe, the world's largest industrial-technology trade show on April 24.
The Hannoversche Allegemeine newspaper says residents have been warned not to wave from the windows of their houses and apartment buildings as Obama and Merkel enter and leave the trade show because it could be seen as a threat.
And London's
Independent says security in the area will be airtight when the two leaders visit.
Residents who live in the area may have to submit to vehicle checks and show their passports if asked.
The extraordinary security measures come as Europe remains on high alert following last month's terror attacks in Brussels and those in Paris last December.
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