The ISIS terrorist who slit a priest’s throat and used a nun as a human shield during an attack in France on Tuesday bragged about his intended assault to an audience of up to 200 people on an encrypted communications app nearly a week before the spree.

The audio files recorded by Adel Kermiche for a private group on the Telegram app were obtained by L’Express magazine and verified for the publication by a source close to the investigation.

Kermiche, 19, says he will “enter a church, take a knife and make a carnage,” according to a translation of one chilling message.

The messages were found during the subsequent investigation into Kermiche, the source told L’Express. Kermiche and his partner, Abdel Malik, were killed by police as they exited the Normandy-area church, attempting to use nuns to shield themselves from bullets.