Overview
- Residents in the Financial District reported a powerful boom near the 24 Hour Fitness on Montgomery Street and said the sound rattled nearby buildings.
- Witnesses posted on social platforms and the Citizen app circulated an alert that led many people to fear an explosion.
- Several people said they saw fire engines responding to the area, which prompted a standard emergency response but did not confirm the cause.
- The San Francisco Police Department has not confirmed that an explosion occurred and officials have released no additional details about the source of the noise.
- Montgomery Street runs through the dense downtown core where loud noises travel far, so investigators will weigh user-generated tips against on-scene findings to determine whether fireworks, a false alarm, or another cause is responsible.