Full Breakdown
Metrobus Fire in 9th Street Tunnel Triggers Citywide Smoke Plume and Fleet Grounding
4/25/2026, 2:36:09 AM
Incident Overview
Around 6:30 p.m. on Thursday, April 23 2026, a Metrobus traveling through the 9th Street Tunnel beneath the National Mall caught fire. The vehicle, a 2015-model hybrid diesel bus from New Flyer, was occupied only by its driver, who escaped unharmed. No passengers were aboard. The blaze generated a dense black plume that drifted over downtown Washington, D.C., and was visible from Old Town Alexandria.
Timeline of Events
- 6:30 p.m. – Fire ignites inside the tunnel.
- 6:35 p.m. – D.C. Fire and EMS receive emergency calls.
- 7:00 p.m. – Firefighters deploy foam and water, running roughly 900 ft of hose.
- 8:00 p.m. – Flames extinguished; smoke begins to dissipate.
- Night of 23 April – 9th Street Tunnel and adjacent 9th Street Expressway closed.
- Morning of 24 April – Tunnel remains shut for inspection; traffic detours posted.
Response and Resources
D.C. Fire and EMS dispatched 41 fire units and approximately 125 personnel. Crews established a perimeter, attacked the fire from both sides, and used suppression foam in addition to water. The tunnel’s ventilation shafts functioned as designed, allowing evacuation of drivers and trapped vehicles.
Impact on Infrastructure and Traffic
The fire damaged tunnel tiling, concrete facings, lighting fixtures, and a segment of asphalt, but structural steel beams remained intact. The closure forced motorists to use alternate routes via 12th Street to Maine Avenue SW and 7th Street SE to the eastbound freeway, creating significant rush-hour delays.
Official Statements & Responses
WMATA General Manager and CEO Randy Clarke announced that, “out of an abundance of caution,” the agency is grounding its hybrid diesel fleet for inspection and is coordinating with the manufacturer to mitigate service impacts. D.C. Fire and EMS Chief John Donnelly emphasized the difficulty of operating in a one-way tunnel and praised the ventilation system that bought evacuation time. DDOT Director Sharon Kershbaum said inspection teams would verify the integrity of tunnel panels and ceilings, a process expected to take about four hours.
Criticism & Opposition
Local critics questioned Metro’s recent safety record, asking “What’s going on with Metro this week?” Clarke responded that the system remains safe, that investigations will be forensic, and that lessons will be applied to improve operations.
On-the-Ground Accounts
Witness Ashley Jamieson described the moment as “the flash happened, then the fire started… the tunnel started filling with smoke,” prompting drivers to flee on foot. Other observers referred to the smoke as a “Fumata Nera,” noting its thickness and darkness.
Conflicting Reports & Gaps
Sources differ on the number of buses removed from service: some report 21 vehicles of the same model, while others cite all 32 hybrid diesel buses in WMATA’s fleet. The fire’s cause is also unsettled; investigators label it “mechanical” in some statements, yet other reports list the cause as “unknown.” No definitive assessment of long-term tunnel structural effects has been released.
Data Summary
- Fire units: 41
- Fire personnel: ~125
- Hose length deployed: ~900 ft
- Hybrid diesel buses grounded: 21 or 32 (discrepancy)
- Tunnel closure duration: from ~6:30 p.m. 23 April to at least the morning of 24 April
What’s Next
WMATA will complete inspections of all hybrid diesel buses and conduct forensic analysis of the fire. DDOT will finish tunnel panel and ceiling checks before authorizing reopening, anticipated for the afternoon rush hour on 24 April. Metro has pledged to communicate service adjustments and to implement any safety recommendations arising from the investigation.
