The investigating judge in Brussels, specialised in terrorism support cases relating to attacks in Paris and Brussels, placed four suspects under arrest, announced on Saturday the Belgian federal prosecutor.Mohamed Abrini, involved in the attacks in Paris, and five others were arrested on Friday in Brussels by the Belgian police, Xinhua reported.The Belgian-Moroccan had been filmed at a gas station to Paris two days before the November bombings, along with Salah Abdeslam.Since the arrest of Abdeslam, Abrini is one of the suspects linked to the "most wanted terrorist" in Paris.Abrini would be more than likely "man in the hat" in the overview of surveillance cameras of the Zaventem Airport on the morning of Brussels attacks, according to some local media reports. His DNA was found in an apartment in Schaerbeek in Brussels, from which the kamikazes left for attacks of March 22 in Brussels.He was placed under arrest and charged the head of participation in "a terrorist group and terrorist murders".According to the Belgian federal prosecutor, it is not yet possible to determine whether or not Abrini is the third present man during the attacks at the airport, the man with the hat.