The UK government has warned British citizens to “remain vigilant” in crowded places including Christmas markets while in Germany, France, and eight other European Union countries.

The Foreign and Commonwealth Office, which is in charge of promoting British interests overseas, updated their travel advice on Monday, with the vast majority of Christmas market warnings being in Western European countries that have been affected by the migrant crisis and recent Islamist terrorism.

The warning for Germany reads: “There is a general threat from terrorism.

“There may be increased security in place over the Christmas and New Year period, including at Christmas markets and other major events that might attract large crowds.

“You should remain vigilant and follow the advice of local authorities.”

France’s warning adds that “Due to ongoing threats to France by Islamist terrorist groups, and recent French military intervention against Daesh (formerly referred to as ISIL), the French government has warned the public to be especially vigilant and has reinforced its security measures.”

‘Allah hu Akbar!’: Migrant Males Arrested at Two German Christmas Markets After Violence https://t.co/7BSqUmDCTn — Breitbart London (@BreitbartLondon) December 4, 2018

Other countries where the FCO warned vigilance around Christmas markets are Austria, Belgium, the Czech Republic, Denmark, Italy, the Netherlands, Poland, and Sweden.

There was a warning to be vigilant during the Christmas period whilst in Spain, but there was no specific mention of Christmas markets. The remaining 16 EU nations — mostly in Eastern Europe — had no such warnings.

The FCO states that information for its travel advice comes from “a number of sources including local knowledge from our embassies abroad and in some cases information gathered by the intelligence services.”

Christmas markets across Western Europe have been under tight security since Tunisian failed asylum seeker Anis Amri, who travelled from Italy to Germany with the 2015 migrant flow, drove a truck into Berlin’s crowded Christmas market on December 19th, 2016, killing 12 people and injuring 56 others.

Video later surfaced of Amri swearing allegiance to Islamic State.

🎁🎄🎁 What better Christmas gift has diversity given us than reinforced cast concrete ❤️❤️❤️ https://t.co/txhTkFBZ4R — Breitbart London (@BreitbartLondon) November 26, 2017

The terror attack prompted towns and cities across Germany to install anti-terror barriers — nicknamed “diversity barriers” — ‘wrapped’ for Christmas to look like gifts, with similar devices being erected in Britain in time for Christmas 2017.

Before Christmas last year, six members of an Islamic State cell were arrested in Germany on suspicion of planning a terror attack, possibly against a Christmas market, with another plot against a British Christmas market foiled the day before.

The raids came after Islamic State had threatened holiday attacks against New York City, London, and Berlin.