(KTLA) — Three students were hospitalized after apparently overdosing on an unidentified narcotic at Johnnie Cochran Middle School in Los Angeles on Monday.

L.A. Fire crews responded to the school near Crenshaw and Washington boulevards around 11:30 a.m. after receiving reports of at least three children “with altered level of consciousness after possible exposure or ingestion of a yet unknown substance,” the department said.

According to Sky5 reporter Rich Prickett, the students responded well after being administered Narcan, which reverses the effects of opioids.

They were transported to an area hospital, where “they arrived conscious and breathing in minor to moderate medical distress,” officials said.

L.A. Unified School Superintendent Alberto Carvalho used the incident to encourage students and parents to report safety issues.

“We remain hopeful for a full recovery of our students … who suffered from a medical incident earlier today,” Carvalho said. “I urge everyone in our school community to download the LASAR app to anonymously report instances of suspicious activity, mental health incidents, drug consumption, drug trafficking, vandalism and other safety concerns.”