Spanish police said Thursday they had arrested a 21-year-old man as he received 140 kilograms of explosives to carry out a Columbine-style massacre of students. The suspect was arrested in the tourist haven of Palma de Mallorca and his hate-filled personal diary and other papers revealed plans to attack the University of the Balearic Islands, they said. Identified only by the initials J.M.M.S., he was detained Wednesday just as he received more than 140 kilograms of exposives that he had bought online, police said in a statement. “In his personal diary and other documents seized at his home, the detainee showed his hatred of society, epecially university students, and his decision to strategically place shrapnel-filled pipe bombs in the university grounds, admitting to a possible suicide in the carrying out of the massacre,” the statement said.