SAN FRANCISCO (CBS SF) — Traffic in San Francisco’s South of Market district was a slow go Tuesday as an outage knocked out stoplights at several intersections, authorities said.

The intersections were turned into four-way stops while traffic officers manned others.

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“Numerous traffic lights are malfunctioning in multiple locations throughout the city, including South of Market between 6th & Mission Streets & 13th & Market Streets; and Folsom & 6th Street down to Folsom & Hawthorn,” the San Francisco Department of Emergency Management tweeted shortly after noon.

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San Francisco Muni officials said there will likely be minor delays on the N-Juday and T-Third muni rail lines.

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Officials did not say what had caused the outage.