Fallout over the Los Angeles school district’s $1.3-billion plan to provide iPads to every student intensified Tuesday with the revelation that the FBI is conducting a criminal investigation into the failed effort.

FBI agents seized 20 boxes of records related to the iPad program Monday, and court documents reviewed by The Times show a federal grand jury is examining the matter.

Federal investigators declined to name the target of the probe. But the FBI’s actions have brought a renewed focus on the program nine months after the Los Angeles County district attorney’s office closed its own review without filing charges.