Belgian police on Monday arrested four people as part of an investigation into a failed terror attack in 2015 on a high-speed train travelling from Paris to Amsterdam, the federal prosecutor's office said.
Police carried out raids in several districts in Brussels and in the towns of Andenne and Marche-en-Famenne, both in the southern French-speaking Wallonia region, reports Efe news.
The raids led to the arrest of the four people who are to be interrogated though no weapons or explosives were found.
On August 21, 2015, an assailant opened fire on a high-speed Thalys train that had just crossed the border from Belgium into France.
A passenger who tried to subdue him was stabbed and four people were injured in total though none were in serious condition.
French police said they suspected it was an attempted terror attack though the assailant claimed it was a robbery.
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