A video showing “several” orcas “attacking” a boat off the coast of Portugal has been shared on social media.

The video shows the occupants of a boat called 'Santa Bárbara' when they realise they are surrounded by orcas.

In the video, the boat can be seen surrounded by the orcas and a woman's call for help can be heard.

"We are being attacked by orcas off the coast of Sesimbra. We are about a mile from Sesimbra", says the woman.

"We have several orcas around our sailboat", she says. There is also a moment in the video where the same person who makes the phone calls says that "she is tired of calling" and that no one answers her.