For the third time in a month a portable toilet was set ablaze overnight, but this time it was in the Marina district.
The fire was reported at 3:48 a.m. at 2258 Francisco St. Arson investigators were called to the scene.
Last weekend an arsonist set fire to a toilet on Haight Street, and a couple weeks prior one was burned down at 1818 Broadway.
A total of 27 portable toilets were torched between November 2008 and March of this year. The most recent arsons put an end to a long hiatus in the attacks.
Most of the arsons in the previous spate of attacks took place in the Russian Hill area in the late-night and early-morning hours.
However, arson investigators cannot say for certain if all of those attacks and the current fires are connected.
No injuries have been reported and no arrests were made.