NEW : Police hail court 's rejection of ` ` attempt to prevent further examination of material seized '' Court bars examination of material seized , except for purpose of protecting national security . Lawyer for the prosecution says a criminal investigation has been launched . `` We welcome the decision of the court which allows our examination of the material -- containing thousands of classified intelligence documents -- to continue in order to protect life and national security , '' police said . He was detained for nearly 9 hours , at Heathrow Airport .
NEW : Police hail court 's rejection of ` ` attempt to prevent further examination of material seized '' Court bars examination of material seized , except for purpose of protecting national security . Lawyer for the prosecution says a criminal investigation has been launched . He was detained for nearly 9 hours , at Heathrow Airport .