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A 16-year-old boy has been arrested in connection with a possible shooting threat to Rancho Cucamonga High School, and a weapon at his home has been seized, authorities said Thursday.

Deputies began investigating Wednesday evening after police received multiple phone calls about threats of a potential shooting at the high school, which is located at 11801 Lark Dr., according to the Rancho Cucamonga Police Department.

The threat was posted on social media, with the alleged violence planned for the following day, police said.

“Via social media, the suspect threatened to bring a gun to school the following day to harm students,” police said in a news release.

Deputies identified the suspect as a 16-year-old Rancho Cucamonga High school student and determined that he was the sole person responsible for the incident, police said.

A handgun was found and confiscated during a search of the student’s home in Rialto, police said.

The unidentified teen was arrested at his residence and booked into juvenile hall on suspicion of criminal threats.

No other threats to the high school were identified during the investigation, according to officials.

“@RanchoPD & @sbcountysheriff take all threats of harm to our students & school staff seriously & investigate them with the highest priority,” tweeted sheriff’s Capt. Ernie Perez.