An urgent warning has been issued after several deadly sea creatures washed up on UK beaches, shocking beach-goers due to their odd appearance.

The Royal National Lifeboat Institution alerted Brits following reported sightings of an "alien" like sea creature in Lancashire and Southport over the weekend.

Portuguese man o'wars, which are also known as blue bottle jellyfish, are highly venomous and can have tentacles as long as 100ft.

The creatures can kill humans in some cases, although it is rare.

Becky Clarke, from Preesall in Lancashire, shared a picture of one of the creatures on the Knott End and Preesall Community Facebook page, commenting: "I found a couple of Portuguese man o'war on the beach at Preesall this morning."

One person responded: "They are covered in venom and can cause excruciating pain! Best to keep away from them!"

Another said: "Their tentacles can trail into hard-to-see threads that still carry the sting for several meters."

RNLI West Kirby Lifeboat tweeted: "This was found today on Caldy Beach. It is a Portuguese man O'war. If you see one, DO NOT TOUCH, They give a nasty sting, even when dead."

It comes after another was spotted by a couple on Ainsdale beach in Southport over the weekend, reports Liverpool Echo.

Karl Lee, 47, was walking with his wife when they spotted a "strange" looking sea animal which they originally thought was a balloon.

He said: "I had a closer look and identified it using an app and realised what it was and how dangerous they are and looked up that they have been washing up along the coast from Cornwall to Cumbria."

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It is possible the recent high tides and strong winds could have led to the sightings on the sands of Merseyside.

Georgia de Jong Cleyndert, a marine conservation officer for the Wildlife Trusts told the ECHO that more of this creatures could be found going forward due to climate change.

She said: "We also received reports of Portuguese Man O’ War washing up near Preesall, Lancashire over the weekend. It seems these open ocean drifters are slowly being blown up the Irish Sea.

"These jellyfish-like animals normally live in the open seas but the strong and persistent winds and autumnal storms that we have been experiencing are causing them to be washed ashore."

She added: "They can't swim and are at the mercy of the winds – which is why they often end up washed ashore after big storms.

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"They have blue tentacles that hang below the surface, stretching over 10 m in length, which have thousands of stinging cells that deliver venom to paralyse and kill their prey (small fish and crustaceans).

"Though it is rarely fatal for humans, their sting can pack a painful punch. They can still sting even when dead so keep children and dogs away.

"With a changing climate and the prospect of more stormy weather, it is also likely that there will be an increase in the frequency of occurrence of stranding's of these beautiful open ocean drifters."

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