On Thursday, the Foreign Office updated its travel advice to Tunisia, warning against "all but essential" trips to the country.
It also urged any Britons in Tunisia at the moment who did not need to be there to leave.
Thomas Cook, Thomson and First Choice have cancelled all bookings up to October 31 and said they will be getting customers out of the country as soon as possible.
If you are currently in Tunisia or planning to travel there, here is advice on what to do.
What should I do if I am in Tunisia at the moment?
Holidaymakers currently in the country with a tour operator have been advised to contact them to confirm their arrangements for getting home.
Those travelling independently should follow Foreign Office advice and consider if it is essential to stay in Tunisia.
I am due to travel to Tunisia soon, what is the advice?
The Foreign Office has warned against "all but essential" travel to the country.
The Association of British Travel Agents (ABTA) warned travelling to Tunisia at this time is likely to invalidate your travel insurance.
ABTA said: "Those with holidays booked within the next 48 hours to Tunisia are advised to contact your travel company to discuss available options.
"If you have booked a package you will be entitled to a refund or alternative holiday.
"If you are not travelling within the next 48 hours you will need to check with your travel company what your options are and follow their advice.
"Anyone with bookings beyond the summer is advised to wait until closer to your departure date to contact your travel company as the situation is fluid and may change.
"Travel companies will decide on an ongoing basis how far in advance they’ll give these options, so check with your travel company regarding your options."
People are advised to check with their tour operators and insurance companies to see what their options are.