LAS CRUCES, N.M. (AP) — A Las Cruces high school student has been arrested after allegedly posting a photo of himself holding a rifle and referencing school shootings, making it the third threat arrest of a New Mexico teen.

Las Cruces police said Thursday that 18-year-old Ernest Padilla has been booked on one count of unlawful carrying a deadly weapon on school premises.

Administrators discovered the photo on social media app Snapchat on Wednesday afternoon. An accompanying message stated "Mexican school shooter" along with the abbreviations for "just kidding."

Police found a butterfly knife and brass knuckles on Padilla and recovered a rifle from his home.

Also on Wednesday, a San Juan County teen made a bomb threat and a 16-year-old Belen boy threatened to carry out a school shooting the next day.