The crash happened Wednesday afternoon as a tree trimming was working nearby.
The tree trimming crew was working on some trees on Pointe Ave., when their truck began rolling down the hill into the San Diego Taiwanese Presbyterian Church at 4426 Harbison Ave. around 1:30 p.m. according to witnesses.
"We all watched helplessly as there was nothing we could do," Rob Engquist, a witness, said. "Turns out they had gone out to reposition it, moved their wheel chalk out fo the way, don't know if the parking break was set or what happened, but the truck was going down the road on its own."
La Mesa officials are investigating how the truck became dislodged. No one was inside the building at the time of the crash. The church's pastor told 10News the building hit by the truck is home to a weekly Bible study held Wednesday nights.
(Photo credit reporting partner 10News)