ISIS supporters have gloated about sleeper cells nestled in Europe which are poised to carry out horror attacks on innocent civilians.
There was doubt around the claims as the man was said to have mental health issues and had previously attempted suicide.
But now Express.co.uk has seen online material from ISIS supporters, claiming sleeper cells are waiting to attack.
One ISIS supporter boasted over Telegram app about upcoming attacks which he claimed would be as deadly as those in Nice and Paris.
He said: ”There are many cells being set up.
"That Islam will bring fear upon their land and each home.
"And many more attacks are carded.
"And on the way in many forms and fashions.
"Until they stop."
The jihadist, who claims to be 28, said Muslims who support the caliphate attack Europe because of the war in Syria.
He also claimed those killed in Nice and Paris should have stopped their national governments from getting involved in the war in Syria.
He said: "Victory is by Allah and with the Muslims.
"What is to happen is to happen with no consequences to anyone
"What makes the citizens normal or innocent?
"When this is their rule or else stand up and abolish the governments."
Political scientist Colin Clarke from the American think-tank RAND has warned Europe not to take the claims lightly.And Israel's:
The jihadi organizations that have pledged allegiance to the Islamic State terror group have allegedly launched joint operations recently mere kilometers from Israel's border on the southern Golan Heights.
A new video released by Islamic State media shows the ISIS-affiliated coalition advancing on the Yarmouk Valley region located in the triple border junction between Israel's Golan Heights, Jordan and Syria, Channel 2 reported Sunday night.
According to the report, the video shows the militants fighting under the banner of ISIS advancing on Syrian rebel positions in the volatile Daraa province where Syrian military troops have fought with opposition forces throughout the Syrian civil war.We were warned that concurrent with the shrinking of its caliphate, ISIS would ramp up terror against its prime enemies.