Killer Whales Sink Yacht off PortugalOrcas Sink Yacht off PortugalA dramatic encounter unfolded in Portuguese waters when a pod of killer whales attacked two yachts carrying passengers. A second yacht carrying four people came under attack near the port of Cascais. This time, the orcas failed to sink the vessel, which was later towed safely to shore. Some claim as many as four orcas participated, while others believe a single aggressive killer whale was responsible for the incidents. Marine biologists continue to investigate why killer whales are increasingly targeting vessels.