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ISIS has issued a new warning for the West and it has world leaders and counter terrorism officials paying attention.

According to a Fox News report:

The Islamic State group has trained at least 400 fighters to target Europe in deadly waves of attacks, deploying interlocking terror cells like the ones that struck Brussels and Paris with orders to choose the time, place and method for maximum carnage, officials have told The Associated Press.

The network of agile and semiautonomous cells shows the reach of the extremist group in Europe even as it loses ground in Syria and Iraq. The officials, including European and Iraqi intelligence officials and a French lawmaker who follows the jihadi networks, described camps in Syria, Iraq and possibly the former Soviet bloc where attackers are trained to attack the West. Before being killed in a police raid, the ringleader of the Nov. 13 Paris attacks claimed he had entered Europe in a multinational group of 90 fighters, who scattered “more or less everywhere.”

While this might seem like an empty threat, when taken with the fact that numerous raids in the country saw several high profile terrorists arrested, including accused mastermind Salah Abdeslam, authorities were still not able to predict or stop the Brussels Airport attack.

Two of the bombers in the Brussels attack had no known prior connection to ISIS or radical Islam before carrying out the deadly plot.

ISIS operatives have made similar claims about the number and spread of potential attackers in the United States.

These issues highlight the ongoing problem of finding and stopping radical terrorists in Europe during an ongoing and evolving immigration and refugee situation.