A Belgian judge on Thursday ordered Mohamed Abrini and six other suspects arrested in connection with the attacks in Paris and Brussels kept behind bars for another month, prosecutors said.
The Belgian Federal Prosecutors Office said Osama K., a Swedish national suspected of being the accomplice of the Brussels subway bomber, was also ordered kept in preventive detention for another month, prosecutors said.
The others included four suspects charged in the Brussels attacks, and one man accused of helping key Paris attacks suspect Salah Abdemslam escape from France to Belgium.
Abrini, Bilal E.M., Smail F, Ibrahim F, Rwandan national Herve B.M., Ossama K. were arrested in Brussels on March 22.
Abrini has admitted being the "man in the hat" seen leaving Brussels Airport the morning two suicide bombers detonated explosives-laden suitcases there, killing 16.
Sixteen other people died that morning when another bomber blew himself up on a Brussels subway train.
France's BFM television reported Abrini claimed to investigators he "wouldn't hurt a fly."
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Abrini also had close ties to the attackers who killed 130 victims on Nov. 13 in Paris and is believed to have traveled to Syria and to have met with suspected extremists in England.
Belgian and French authorities have detained dozens of suspect in their investigations.