Authorities say a house holds a second homemade explosive , PETN . PETN happens to be the target of new U.S. airport body scans and pat downs . Comment: In recent days , technicians found improvised grenades that were n't live , he said . Bomb technicians must be careful ; the slightest friction could cause an explosion .
Authorities say a house holds a second homemade explosive , PETN . PETN happens to be the target of new U.S. airport body scans and pat downs . Comment: Bomb technicians must be careful ; the slightest friction could cause an explosion .