This video from California in the USA says about itself:
Killer Whales Ambush A Pod of 1,000 Dolphins
14 April 2016
This was an incredible encounter. I just happened to be in the right spot at the right time. It’s very rare that everything comes together and we’re able to document these types of encounters. We know it happens regularly with the common dolphins. But there’s rarely someone there with their video camera focused and waiting for it to happen. Incredible morning on The Monterey Bay for me.