No one's sure why a Blue & Gold Ferry crashed into San Francisco's Pier 41 on Sunday, injuring ten passengers and causing minor damage. According to the Coast Guard, there was no mechanical reason for the collision, leaving some to wonder if the crew was to blame.

At around 5:45 p.m. Sunday, 230 people were on Blue & Gold's Oakland-bound Peralta, which was backing out of Pier 41 when it hit a piling on the pier.

According to a passenger who spoke to ABC7, "I kind of saw it coming. A lot of people didn't, and it just hit the pylon and I saw kids flying, and it was pretty bad."

Ten people were taken to the hospital after the collision, suffering from back pain, neck pain, cuts, and bruises.

The collision didn't damage the ferry, and caused "only minor damage to the piling at Pier 41," a Coast Guard spokesperson told the Chron.

ABC7 reports that the Coast Guard examined the ferry and couldn't find any mechanical issues that might have caused the crash. It has since returned to service, according to KRON4.

Meanwhile, the crew has undergone drug and alcohol tests, the results of which were not available as of Monday morning, a Coast Guard spokesperson tells SFist. Blue & Gold Fleet did not return a call from SFist regarding the collision at publication time.