(NaturalNews) The carcasses of three more marine mammals washed up on the shores of San Francisco beaches July 7, 2015. No one is sure what killed the sea creatures; however, the massive amounts of radiation leaking into the ocean from the Fukushima power plant over the past four years may bear some responsibility.

Joey DeRuy was walking along the beach Monday when he stumbled across a dead sea lion. Unperturbed, he kept walking until he came across an even bigger dead elephant seal just minutes later.

By the end of the day, there were three dead sea creatures lying on San Francisco's coast: a dolphin, a sea lion pup and an elephant seal.

National Park Service lifeguards tried to dispose of the dolphin, but they weren't quite sure how to handle the mammal. They lifted the dead dolphin into a truck, but it was so large that its tail was hanging halfway out the truck's bed.

Alarming rise in dead marine life since Fukushima disaster

This isn't the first time the Grim Reaper has visited the shores of San Francisco's coast. Approximately six dead whales have washed onto Bay Area shores within a five-week period this year. In addition, for the past four years, an alarming number of starved sea lion pups have littered Southern California's shores. The National Oceanic and Atmospheric Administration (NOAA) described this stranding as an "Unusual Mortality Event," and animal shelters have reached critical capacity.

All of these events just so happen to coincide with the Fukushima disaster four years ago. A tsunami sent ripples throughout the world as it slammed against Japan's Tohoku coast, destroying three nuclear reactors in all. Since then, untold amounts of radiation have been leaking into the ocean and contaminating sea life.

For more information on the unfolding damage caused by the Fukushima disaster, visit FukushimaWatch.com.