Debris from shipping containers washed up on Baker Beach over the weekend.
Now, the Coast Guard is looking into whether the debris is linked to missing containers that fell off a cargo ship a few days ago.
It happened during high seas and windy weather Friday evening.
A US shipping vessel called the Manoa left San Francisco and headed to Hawaii on Friday evening.
During the windy weather, the ship lost 12 of its shipping containers as it was making a turn.
Salesforce CEO Marc Benioff tweeted photos of the containers that washed up on Baker Beach.
Hey Matson Shipping looks like you can find your missing container in between China Beach and Baker Beach! pic.twitter.com/U2Qcu3Nsb5— Marc Benioff (@Benioff) December 13, 2015
There were packaging materials and crates inside the containers.
The containers didn't contain anything hazardous.
As of early Monday morning, the debris was not completely cleaned up.
The vessel and the shipping containers are owned by Matson Navigation.
The Coast Guard says Matson is aware of the problem. They've hired an environmental contractor to clean it up.