UK police released a video advising tourists on how to survive a shooting, in case one breaks out during the summer holiday season.
The four-minute video carried the simple message to anyone facing a terror squad in an office or public place: Run, hide and tell the police.
Counter-terrorism officials say they want to raise awareness, given recent attacks.
Meanwhile, the government is urging holidaymakers to "watch it" before traveling abroad.
Since the Sousse attacks in 2015, the travel industry has upped its preparedness.
20,000 travel agency staff working in resorts frequented by Britons have been trained in spotting suspicious activity and responding if a terrorist incident unfolds.