nicolas burns was previously leads thetarymini callimachi isis coverage.oining us from brussels, peter spiegel, he is the bureau chief from the financial times. peter, may i begin with you. tell us exactly what is the status of the investigation today in brussels? peter: a lot of raids have happened. it surely when the bombs went off in the airport and the metro raids in aw several neighborhood. they covered bomb making -- they recovered from making materials, isis flags. they recovered bomb making they recovered bomb making materials, isis flags. that is why those rates are going on. -- those raids are going on. how extensive this cell is -- like periods, a very sophisticated operation. -- like paris, a very sophisticated operation. that's a speculation. literally 24 and 48 hours ago belgian authorities were saying they were nervous because the arrest made on friday, the last remaining at lawrence haverty paris, because he was arrested -- last remaining at-large terrorist from paris, because he was arrested, they thought they were connected. that is the s