Mission District residents might have been alarmed by a massive San Francisco Police Department response to an area public housing development Tuesday evening, and wondered what exactly went down. The answer, after hours of police activity? Not much.

According to SFPD spokesperson Sergeant Michael Andraychak, at 5:58 officers in the Mission "saw a subject who was wanted in connection with an aggravated assault."

The suspect, whom police declined to describe, "fled into a building on the 1400 block of Treat Street," Andraychak says.

That block of Treat Street is located between 26th and Cesar Chavez Streets. According to the San Francisco Housing Authority, buildings on that block are part of Bernal Dwellings, a privately-managed, "160-unit, mixed income community."

Andraychak says that tactical units and crisis negotiators "were called to the scene," as police continued what they believed was a standoff with the suspect, one that went on for hours.

In fact, it wasn't until 8:29, Andraychak says, that police realized that the suspect wasn't actually in that building at all, and the standoff was for naught.

According to Andraychak, officers then resumed the search for the suspect. As of publication time, however, it appears that no arrests were ever made.