San Francisco Fire Department details two greater‑alarm fires, mutual‑aid lessons and new DISCA radio interoperability

Deputy Chief Darius Luthrop told the San Francisco Fire Commission that September’s overall call volume was near last month’s level but highlighted two complex incidents that required expanded coordination.

Luthrop described a greater‑alarm residential fire at 2975 Mission Street that resulted in one injury and required a second alarm response. He said firefighters encountered heavy exterior fire and hoarding conditions inside exposed buildings, and that crews shifted tactics after confirming the building addresses. Assistant Chief Patrick Rabbit, who led the incident, later told commissioners he prepared a collaborative, chronological incident narrative following an on‑scene after‑action review.

Luthrop also reviewed a second greater‑alarm at the Bayshore area reported to multiple box numbers (2630/2634 Bayshore) that involved units from neighboring jurisdictions including Daly City and San Mateo County. The incident prompted an ad‑hoc unified command and, while there were no injuries, Luthrop said it exposed the need for clearer mutual‑aid expectations along jurisdictional borders.

"A typical response for a county‑to‑county border like this would prompt something called automatic aid. We do not have an automatic aid agreement with these municipalities necessarily," Luthrop said, describing the event as an "accident of geography" that required quick on‑scene division of tasks and a unified command between incident commanders.

Commissioners pressed for details about who assumes command in split‑jurisdiction incidents. Luthrop said the legal primacy rests with the location of the fire, but in practice incident commanders coordinate control and may agree on a single voice for management. "Historically, while they may maintain overall incident command, the control of our resources would definitely be in the hands of our chief officers," he said.

Luthrop also outlined broader regional mutual‑aid mechanisms, from immediate need requests under the state master mutual aid agreement to strike‑team deployments and single‑resource contributions. He described the department’s participation in California Task Force 3 and recent statewide deployments to wildland incidents.

On interoperability, Luthrop highlighted a city effort to patch military radios into the municipal radio system as part of Defense Support of Civil Authorities (DISCA) operations during Fleet Week. "We were able to achieve air‑to‑ground communication with navy and marine helicopters," he said, calling the capability a year‑long technology effort that will support future civilian‑military responses.

Commissioners praised the incident write‑ups and photographs included in the packet and asked follow‑up questions about an Octavia and Fell Street investigation and a noted increase in outside fires. Luthrop said some investigations are ongoing and that resource limits constrain the Bureau of Fire Investigation’s ability to probe every outside‑fire report.

The exchange concluded with commissioners thanking crews for Fleet Week support and for pallbearer duties honoring the late Senator Dianne Feinstein. The commission moved on to grant and policy items after the operations briefing.