Three Chechens suspected of “terrorist” activities on behalf of the Islamic State group in Khorasan were jailed today in Belgiumthe next in a series of investigations conducted under fear of an attack, the federal prosecutor’s office announced.

Seven people, all of Chechen origin, were arrested on Thursday during the police raid. Among the three, against whom the judge decided to indict and jail, two are suspected of “preparing a terrorist attack”. However, there is currently “no concrete indication of a specific target,” the prosecutor’s office said.

Four other people taken into custody during searches of homes and other places across the country on Thursday were released, three of them after being questioned by an investigator, according to the prosecutor’s office.

Prosecutors said all seven taken into custody in the Brussels region and in cities including Antwerp, Liege and Ghent are of Chechen origin, with the three charged on suspicion of being members of the Islamic State in Khorasan, the Afghan offshoot. of the Islamic State.

Prosecutors said there was no indication the suspects had chosen a specific target without providing more information. Belgian media had reported that investigators did not want any danger so close to the Paris Olympics.

The prosecutor’s office did not respond to a Reuters question about whether the arrests were possibly related to the Games, whose opening ceremony is scheduled for tonight.

France’s anti-terrorism prosecutor told Reuters that no arrests or inquiries had been made in France as part of the investigation, but did not say whether French authorities were involved.

The perpetrators of the 2015 Paris attacks, which killed 130 people and injured 368, largely planned and coordinated their attack from neighboring Belgium, and several of the attackers were Belgian citizens or residents.

In 2016, the Brussels airport bombings killed 34 people and injured 340. Among those convicted in the attacks was Salah Abdeslam, who was also the prime suspect in the Paris attacks trial.