This video says about itself:
Rare Shark Feeding Frenzy in North Carolina
On Thursday, October 9  at around noon, while at a retreat at Cape Lookout National Seashore off the coast of North Carolina, the leaders of One Harbor Church witnessed a shark feeding frenzy. The men were out fishing for the evening’s dinner when they stumbled across more than 100 sharks attacking a school of bluefish. As seagulls and pelicans joined in on the meal, the men began to cast into the surf, catching fish without the use of bait. For more than five minutes, the sharks were observed swimming in and out of the surf, some of which became beached in the fury.
eNature Blog in the USA writes about this:
Amazing Video Shows Shark Feeding Frenzy In The Surf Off North Carolina Beach
Posted on Tuesday, October 14, 2014 by eNature
Several species of shark, including the popular blacktip that frequents the coastal waters of Virginia and the Carolinas during the summer, can be clearly seen literally on the beach in a feeding frenzy video posted to YouTube last week.
The video, posted by user Brian Recker, shows sharks feasting on a school of smaller fish, most likely bluefish, in shallow water at North Carolina’s Cape Lookout National Seashore.
While it’s not uncommon on East Coast beaches to find schools of small fish in the surf when they are chased up on the beach by predators, most observers encounter bluefish chasing smaller fish such as herring or mullet. It IS uncommon to see bluefish as the prey being chased—and sharks so exposed on the beach.
Here is another video on this.