Hot: Chilling warning about new terrorist group more terrifying than IS

Rebels from different parts of Syria are flocking to join a new group described as a "second Islamic State" in Syria.

Peter Theo Curtis, an American journalist who goes by the pen name Theo Padnos, has been in captivity for more than two years after being kidnapped in Syria by the al-Qaeda-linked al-Nusra Front in 2012. He said some dangerous groups are going unnoticed.

IS is notorious for its brutality in the areas it occupies in Syria and Iraq. (Photo: Daily Star)

“We will know this when they appear in Paris or London with Kalashnikovs,” Theo told Russian news agency RT.

During his arrest, Theo said he witnessed many armed groups emerging in northern Syria, leading him to believe there would be the rise of a "second Islamic State" near Europe and the Turkish border.

The American journalist's comments came as the coalition continues to reclaim territory from the Islamic State (IS), with leader Abu Bakr al-Baghdadi reportedly admitting defeat.

"Something very dangerous and alarming is happening in northwestern Syria, and that is the emergence of a second Islamic State. Right on the Turkish border. To get to the second Islamic State from a European country is a couple of days by bus."

"Young people are coming there every day, that's what people on the ground in Syria tell me. Yes, there are new French, new English every day."

Speaking to Russian news agency RT, journalist Theo added: "I think the West's understanding of what is happening in Syria is incomplete. They (the West) do not know what is happening on the ground, they do not understand the language, or maybe the people who inform them are making things up."

Mr. Theo said the emerging rebel group possesses "tons of weapons" and could be more dangerous than IS.

According to VNN