Officer Gordon Shyy, a police spokesman, says the first car was found flipped on its roof and a second was spotted on its side around 1 a.m. Monday in the Bernal Heights neighborhood.
Shyy says a third Smart car was discovered flipped on its trunk around 1:30 a.m. in the Portola neighborhood, and a fourth was overturned shortly after 9 a.m., also in Bernal Heights.
Police say the small cars' windows shattered and they suffered body damage. The vehicles were placed back on their wheels and towed away.
The incidents are under investigation. Police say they are looking for multiple suspects wearing black hooded sweatshirts who were in the area early Monday.