Following the murder of an 84-year-old priest by two armed men at a church in Rouen, Northern France, on Tuesday a security expert has warned that governments may soon resort to electronic tagging, detention or even deportation of potential suspects in order to stem the rising tide of terror-related attacks.
Professor Anthony Glees, director of the centre for security and intelligence studies at Buckingham University, says those who are deemed to be a threat "have to be confined in some form or another".
The two attackers, who held five people hostage in the church before slitting the throat of Father Jacques Hamel, were later shot dead by armed police at the scene. French proseutors say one other person has been detained.
The Amaq news agency, which is linked to the terror group calling itself Islamic State (IS), claimed it was "two IS soldiers" who conducted the attack, while French TV has reported that one of the hostage-takers was known to the intelligence services.
"People like that need to be known about in future, but that's just the first step," Glees said.
"The second step, I fear, is that those people identified as a threat in this way will have to be confined in some form or another.
"It could be detention, it could be electronic monitoring, it could even be deportation. Those people who are in France and Germany who have no right to be there should be sent back to their countries of origin.
"The situation in Germany and France is rapidly getting out of control."
Listen to the full interview to hear more