A student was arrested Wednesday in connection with a stabbing at Mission Hills High School in San Marcos. The San Diego County Sheriff’s Department received a call Wednesday from a person who claimed to have been stabbed at the school, located at 1 Mission Hills Court. When deputies arrived on campus, a school resource deputy found the victim on school grounds, the sheriff’s department said. The victim — also a student of the high school — was taken to the nurse’s office for treatment before he was taken to a hospital with serious injuries. He is expected to survive, the department said. Deputies were given information at the school about a possible suspect in the stabbing, and that person was arrested at his home a short time later, according to the department. The identity of the age of the suspect was not disclosed. The high school was placed on lockdown just before 3:40 p.m., and authorities lifted the order after the suspect was arrested.