What shark is aggressive and known to attack humans?

The bull shark, which swims in fresh and salt water, is a very aggressive shark and is suspected of attacking 3 people in a New Jersey creek in 1916 that inspired the book/movie Jaws. A great white is thought to have attacked two people in the ocean off the coast of New Jersey around the same time. Bull sharks are considered more dangerous to people, and will be around more humans in fresh and salt water, than the great white which is limited to salt water. Another dangerous salt water shark is the tiger shark.