A man with a knife broke into an Oakland cathedral Sunday morning, disrupting a morning Mass while parishioners called 911 and were placed on hold, according to members of the diocese.

Father Brandon Macadaeg said the Cathedral of Christ the Light near Lake Merritt was full and he was just starting the eucharistic prayer when a “very disturbed man” drove into the Cathedral plaza at 40 miles per hour and screeched to a halt, leaving a 30-foot skid mark outside.

After security guards locked the doors, the man tried to break a side door with his knife and then attempted to enter the loading dock through an exit ramp, where he assaulted one of the guards, Macadaeg wrote in a detailed account of the incident that he sent to parishioners.

Finding that the loading dock entrances required key cards, the man ran up to the healing garden and forced his way into a side door as a parishioner was leaving. He approached the altar, brandishing the knife, and sat in the bishop’s chair.

“Seeing him approaching the altar with a knife certainly caused me to be a bit skittish, as I was unsure if he was coming to me,” Macadaeg wrote.

The man, who has not been named, derailed the service for seven minutes before asking the deacon to show him a ladder that allows church workers to change light bulbs. The deacon escorted him out and he drove away. Police arrived at 12:27 p.m., half an hour after the man drove into the lot.

“The Mass continued as usual,” Macadaeg wrote.

Full story at MSN.com.