Commercial fire alarm at library on West Mariposa Heard on: Los Angeles County CA Fire Dispatch 00:08 00:00 Engine 34, commercial fire alarm at the library, 111 West Mariposa. 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. 00:00 Engine 34, commercial fire alarm at the library, 111 West Mariposa. 00:04 111 West Mariposa. 00:06 No type, no reset, engine 34. 2026-10-28 04:41 UTC Fire W Mariposa St, Altadena, CA 91001 View on map