Fire alarm at Grand Terrace High School Heard on: San Bernardino County Fire - Valley 00:09 Commercial fire alarm, medic engine 23 at Grand Terrace High School, (number withheld) Main Street between Michigan Street and Main Street. Transcript This transcript is auto-generated from live dispatch audio and may be incomplete or inaccurate. It is not an official report and may change. Commercial fire alarm, medic engine 23 at Grand Terrace High School, (number withheld) Main Street between Michigan Street and Main Street. 8/5/2026 05:13 AM Fire Main St, Grand Terrace, CA 92313 View on map