Massachusetts Air National Guardsman Jack Teixeira searched the internet for some of the nation’s worst mass shootings, a new 50-page motion states.

Those searches, federal prosecutors say, included the terms: “Ruby Ridge,” “Las Vegas shooting,” “Mandalay Bay  shooting,” “Buffalo tops shooting,” and “Uvalde.”

He used his government computer, the feds add, to look up those mass casualty tragedies.

The motion to keep Teixeira locked up is packed with concerns prosecutors have about the guns he owns, alleged betrayal of documents he vowed to protect and hate-filled comments he made to consider setting him free.

“No conditions of release will reasonably assure the Defendant’s appearance, the safety of any person or the  community, or the integrity of this proceeding,” U.S. Attorney for Massachusetts Rachael Rollins and her team state.