By Sonya Hamasaki and Darran Simon

CNN

(CNN) -- Two adults are dead in a shooting Monday in a classroom at San Bernardino's North Park Elementary School in what is believed to be murder-suicide, San Bernardino, California, Police Chief Jarrod Burguan tweeted.

Authorities believe the suspect is down and there is no further threat, Burguan said.

Burguan said two people were wounded; the victims, who are believed to be students, were transferred to a local hospital.

San Bernardino City Unified School District will release a statement shortly.