Abergavenny holidaymakers must be alert to the threat of terrorist attacks as they prepare to fly off on summer breaks, police have said.

Counter-terrorism experts released a four-minute film this week urging travellers to ‘run, hide, tell,’ in the event of an emergency akin to the attack on a Tunisian beach resort which left 38 dead, two years ago.

Police and ministers are urging tourists to make themselves aware of the key steps they must take to stay safe in such a situation.

The harrowing video outlines professional advice as a terror attack at a hotel unfolds in the background.

Two years ago, thirty Britons were killed when a gunman opened fire on Western tourists at a Tunisian beach resort. ??Police were keen to emphasise that no specific threat is known, and the video forms part of a general safety campaign.

Detective chief superintendent Scott Wilson, national co-ordinator for the protect and prepare strategy, told the Press Association, “As we saw in Tunisia in 2015, any Westerner is likely to be a target anywhere in the world. That’s the sad reality of it.

“We’ve seen attacks in numerous countries so we are trying to say Western tourists overseas should be aware of what they should and shouldn’t do if they are caught up in such an attack.”

The ‘run, hide, tell’ message was first introduced by UK police in December 2015 and was activated during the London Bridge atrocity last month.

The guidance says that people should run to a place of safety if there is a safe route, leaving belongings behind and insisting others go with them. If there is nowhere to go, then they should hide by barricading themselves in and turn their phones to silent.

Then, only when it is safe, they should alert the authorities by calling the local emergency number, which holidaymakers should find out in advance.

Mr Wilson said, “We want people to think of this in the same way they do the safety film airlines show before take-off.“They don’t expect anything bad to happen but it is a sensible safety precaution to show people what to do.”

Foreign Office minister Lord Ahmad of Wimbledon encouraged people to watch the film before they go away.

“While there is no specific information that British holidaymakers will be targeted this summer, it sets out some simple steps we can all take to minimise the impact of an attack if one does take place.

“More than 20,000 travel reps have been trained in safety measures including how to spot suspicious items and activity, as well as what to do in the event of a major terrorist incident.”