Britons in Greece warned of dangerous disruptions expected within weeks

The FCO confirmed these can take place in places where tourists are likely to visit.

Demonstrations can take place at any time but have traditionally happened on prominent days for the country, including two big dates in the coming weeks.

The FCO states: "Demonstrations may happen at short notice, and have traditionally happened on 1 May, 17 November and 6 December."

Those visiting popular tourist areas, such as Athens, should be wary.

It continued: "Demonstrations take place regularly around major squares in central Athens, in particular Syntagma Square.

"There is currently a heightened risk of demonstrations, particularly in central Athens.

"Nationwide strikes and protests can occur at any time and may disrupt road, air, sea travel and cause delays or diversions at border crossings."

Travel strikes are also something to consider, the body warned.

Those who are in an area where demonstrations are taking place are urged to be careful.

The FCO continues: "There is currently a heightened risk of demonstrations, particularly in central Athens, related to events in Israel and the Occupied Palestinian Territories.

LATEST DEVELOPMENTS

• The European towns that will pay Britons up to £45,000 to move - Spain, Italy and more
• Inside the brand new cruise ship with sleek beach club and world's first 'slidecoaster'- pictures
• The worst place for British expats to move to has 'red tape everywhere' - full list

"Nationwide strikes and protests can occur at any time and may disrupt road, air, sea travel and cause delays or diversions at border crossings."

Holidaymakers recently faced chaos as a Saga cruise ship veered and injured 100 passengers.

Britons in France have been given a travel warning as severe disruptions are expected.