The US Coast Guard says that around 2:30 Wednesday morning, a tug and barge heading from San Francisco to Petaluma struck the Petaluma railroad bridge. Offiicials say neither the tug nor barge were damaged, but a section of the bridge measuring fifteen feet by ten was damaged.

Coast Guard officials say those onboard the vessels were immediately tested for alcohol and drugs. The alcohol test came back negative, showing no one had been drinking. Results from the drug test will take longer to process.

There were no signs of pollution following the accident. The Coast Guard is still investigating the accident.