SAN FRANCISCO (CBS SF) — A massive 40-foot tree toppled onto a car in San Francisco Sunday morning.

Authorities said the tree came down around 10 a.m. near Stanyan and Shrader streets near Golden Gate Park.

Impact of the tree smashed the cars back window, dented its roof and flattened all four tires. Fortunately, no one was injured.

Authorities say they are trying to determine why the tree toppled over.