The note from Belgium's anti-terror unit to police, which was published by Derniere Heure newspaper, warned on Wednesday, "Fighters travelling without passports left Syria about a week and a half ago in order to reach Europe by boat via Turkey and Greece."
French police officers observe a minute of silence during a ceremony in memory of a French police officer and his wife, killed on June 13 by a man claiming allegiance to the Daesh Takfiri terrorists, at the Eveche police station in Marseille on June 16, 2016. (AFP photo)
"These people are thought to have split into two groups - one for Belgium, the other for France in order to commit terror attacks in groups of two," the memo sent to police and security services across Belgium said, adding, "According to information collected, these people are thought to already be in possession of the necessary weaponry and their attack is imminent."
Belgium is still reeling from bombings claimed by Daesh at Brussels airport and on the city's metro on March 22, where 32 people were killed and hundreds more injured.
On November 13, 2015, terrorists carried out shooting attacks and bombings in Paris, France, killing 130 people.
France, which is currently hosting the Euro 2016 football event, is on maximum alert.
French Prime Minister Manuel Valls has warned that there will be more terrorist attacks following this week's murder of a policeman and his wife by a man who pledged allegiance to Daesh.
The attacker on June 13 also took the couple's three-year-old son hostage in the attack. The boy was found unharmed but in a state of shock after police commandos stormed the house and killed the attacker.
French fire brigade members aid an injured individual near the Bataclan concert hall following fatal shootings in Paris, France, November 13, 2015. ©Reuters
The killings came hours after a gunman claiming allegiance to Daesh fatally shot 49 people at a nightclub in Orlando, Florida, during the early hours of June 12. The Orlando shooter, identified as Omar Mateen, had reportedly traveled to Saudi Arabia twice, in March 2011 and March 2012.
The Western and European governments were repeatedly warned of a Takfiri backlash when they began supporting militants in their bid to topple the Syrian government.
Those threats have come to pass as attackers linked to Daesh and other Takfiri groups have targeted several countries across Europe.
Belgian servicemen stand guard as people gather at the makeshift memorial on the Place de la Bourse Square, in Brussels, on March 27, 2016, to pay tribute to the victims of the Brussels terror attacks. ©AFP
In early April, the International Centre for Counter-Terrorism, based in The Hague, said in a report that Belgium, Britain, France and Germany contributed to the militancy in Iraq and Syria by having 2,838 of their nationals traveling to those countries to join terror groups.
That is more than half of a total of 4,294 foreign fighters who have left the EU member states for those two Arab countries over the past few years.
Western officials estimate that several hundred of the disillusioned extremists have so far returned to their European home countries.
Estimates suggest that some 30,000 foreign fighters from about 104 countries were fighting in Iraq and Syria between September 2014 and September 2015, Press TV reported.
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