The death of the supreme leader Baghdadi is expected to make the IS rebels angry and massively attack Europe for revenge.

US President Donald Trump once called European countries a "great disappointment" for not accepting the participation of citizens in fighting for the Islamic State (IS) rebellion to self-repatriation after the organization. This terror is defeated.

"In fact, I once told them that if you don't accept them, I will throw them right on your border. And you can catch them happily. But American taxpayers won't pay money for that in the next 50 years, "Trump said at a press conference announcing his campaign to kill Supreme Leader Abu Bakr al-Baghdadi last weekend.

Now, when Baghdadi has been defeated, in a "headless" crisis and with the desire to avenge the leader, IS fighters or IS supporters are hiding in the heart of Europe. There will be a strong rise, increasing the risk of "lone wolf" terrorist attacks, the expert said.

US-backed Syrian Democratic Forces (SDF) say they currently hold around 800 ISIS fighters in Europe, alongside about 700 women and 1,500 children living in Syrian refugee camps. They were all those who fled from ISIS after the so-called "Islamic state" collapsed. Of these, there are very few Americans.

The intelligence community has repeatedly warned that when ISIS collapses, gunmen will frantically launch "revenge" attacks, triggering a new wave of crisis in Europe. These warnings became even more urgent when Turkey sent troops into northern Syria, prompting Kurdish militia to put up forces and ignore the task of holding back ISIS.

According to Muhammed Hasik, IS militants currently detained at the superlative security prison in northern Iraq, the supreme leader Baghdadi may have died, but the world will certainly not safer than before.

In an interview with ABC News, Hasik showed no regrets about his actions while in the IS ranks, believing that sooner or later a major attack on Europe will occur.

"There will be something happening in Europe because so many people are angry at the death of Baghdadi," Hasik said. "It is not important for President Trump to declare that the Islamic state has come to an end because the IS still exists. When one person dies, another will take over."

US Senator Bob Menendez also warned the White House that "it is not time to announce the 'Mission to Complete'". "Bin Laden's death will not end al-Qaeda and Baghdadi's death will not end IS," he said. "There is still a force of nearly 30,000 IS fighters. It is a clear and present danger."

When asked if the world was safer after Baghdadi's death, Hasik immediately countered. "Things can get worse, even more dangerous than before," he said.

French Interior Minister Christophe Castaner meanwhile called for increased vigilance to prevent potential attacks from IS. "IS is likely to intensify the propaganda about jihad after Baghdadi's death, calling for vengeance, so we need to be very vigilant in the way public events come," he noted.

French President Emmanuel Macron said that Baghdadi's death was a powerful blow to IS, but this is not the end for the organization. "The international coalition's fight against IS will continue until the terrorist organization is completely wiped out," he said.