A Spanish police report concluded that the bomb could have been manipulated by unidentified persons in Ifema (in Spanish, "pudo ser manipulada por personas no identificadas en el Ifema"), which was the Madrid exhibition center where objects found in the trains were temporarily stored. While DNA from an unidentified male was found on or in the bag, Spanish police asserted that the 'chain of custody' was unbroken and the PP leader, Mariano Rajoy, asserted in March 2006 that he had no doubts about the validity of this police exhibit.