A Belgian terror cell with links to the Paris and Brussels attacks had acquired bomb-making chemicals before it was smashed by police last year, a judge said Monday at the opening of the trial of the cell's members, AFP reports.

Seven men who went on trial Monday in a Brussels court were arrested after a deadly raid in the Belgian town of Verviers in January 2015 which exposed an alleged plot to kill police officers.

Nine suspects who are still at large are being tried in their absence.