Another outhouse goes up in flames in San Francisco

The epidemic of arson attacks against San Francisco outhouses continues.

Another portable toilet was set ablaze early Thursday, this one at Union and Franklin streets. That's a few blocks west of where most of the other 13 attacks on construction-site outhouses have taken place in the past two months; those fires were set on Russian Hill.

No one has been hurt in the incidents, all of which have all happened at night. But the latest arson attack at 5 a.m. Thursday damaged a nearby parked car.

The fires have occurred inside and outside of outhouses. In some cases, the arsonist has broken into locked toilets to burn them, police said.