San Marcos High School went into lockdown and police investigated the campus for a possible shooter after receiving reports of an 'active attack' at the school.

San Marcos High School is currently on lockdown after a threat received in an anonymous phone call, the San Marcos Consolidated Independent School District said Tuesday afternoon. San Marcos Police Department officers are at the school and "investigating the entire campus,

More than 80 officers responded to a lockdown at San Marcos High School. No injuries were reported and investigations into the threat are ongoing, according to local officials.