PHOENIX — Central High School in Phoenix was placed on lockdown Friday afternoon as officers worked to clear classrooms and investigate "possible popping" sounds allegedly heard on campus.
The next day, police say three students were detained during the investigation and later identified as victims of an assault. A suspect in that incident is still at large.
Officers responded to the scene on Friday shortly after 12 p.m. after receiving reports of a possible shooting on the campus.
Around 2 p.m. Phoenix police gave the all-clear and said no evidence had been found to suggest any gunshots had been fired.
A couple of people suffered heat-related injuries due to the campus lockdown, police said.
Phoenix Union school district said all students were safe and asked parents not to come to campus. Reunification took place at Indian School Park on Central and Glenrosa avenues.
Phoenix police said the Xavier, Brophy and Coding Academy campuses were also on put on lockdown as a precaution.
Roads leading into Central High were closed down during the lockdown and Valley Metro temporarily closed nearby light rail stations.
Pictures taken at the scene show a large police presence outside the high school campus.
Police say officers will clear each classroom on the campus before the lockdown is lifted.
A police spokesperson warned citizens to not come to the high school campus bringing weapons.
Phoenix police responded to a social medial threat last Thursday that triggered a lockdown at Central High School. Police detained an individual in relation to that threat.
Over the last few weeks, several other incidents have been reported at schools across Arizona involving threats and students bringing weapons to school.