A 20-year-old woman was dragged off the street at knifepoint before a neighbor observed the attempted kidnapping and intervened, according to police.

The woman met the 55-year-old man while walking down the street in the Excelsior district Friday at 6:40 p.m., according to San Francisco police. At some point, the man pulled out a knife and attempted to drag the woman into a house, police said.

A neighbor saw the struggle and stepped in to stop the kidnapping, which occurred near Mission and Leo streets, police said.

The neighbor detained the suspect until police arrived and arrested the man.