Irish citizens are being urged not to travel to Tunisia, with fears another terrorist attack is likely.

The travel advice from the Department of Foreign Affairs has been changed from 'exercise extreme caution' to 'avoid non-essential travel'.

It comes just two weeks after the Sousse beach shooting claimed the lives of an Athlone couple, a woman from Meath and 35 others.

In a statement, Minister Charlie Flanagan says: "We are now encouraging any Irish visitors to Tunisia to review whether their presence in Tunisia is essential and, where it is not, we are advising them to leave by commercial means."

"Following the decision by travel companies to discontinue direct flights from Dublin to Monastir earlier this month, we believe that relatively few Irish visitors are currently in Tunisia."

"Our embassy in Madrid, which is accredited to Tunisia, will be notifying those Irish citizens who are resident in the country of the changes to the travel advice."

"I strongly encourage Irish citizens in Tunisia who are not yet registered with the Department but who plan to remain in Tunisia to register without delay," Mr Flanagan added.

Meanwhile the British Foreign Office has also advised their citizens to leave the country as soon as possible if they are there on non-essential travel.

Paul Rodgers is a professor of peace studies in Bradford University.

He told Newstalk Breakfast earlier it is believed the fatal attack a fortnight ago is part of a wider cell.