Officers responded to two separate reports of toilets on fire shortly after 12:30 a.m. Sunday. One of the fires was at 18th and Sanchez streets, and the other was several blocks away at 18th and Douglass streets, according to police.
The portable toilets were both outside homes under construction, and in each case, half of the backside of the toilet was melted by the flames, police said.
Arson is suspected in both fires, but no suspects have been identified, according to police.
Anyone with information about the blazes is encouraged to call the Police Department's anonymous tip line at (415) 575-4444 or send a tip by text message to TIP411.