ROME - Investigators in the southern Puglia region said Thursday that they had detained a suspect in a school bombing that killed one student and injured five at a Brindisi school three weeks ago.

After hours of interrogation that started Wednesday, officials said, a 68-year-old fuel vendor from Copertino, about 30 miles north of Brindisi, was arrested on suspicion of attempted multiple homicide with the intent of terrorism. The authorities later identified the man as Giovanni Vantaggiato.