Israel has been faced with a new threat from the sea – a swarm of jellyfish.

The sea creatures have managed to interfere with the running of a power plant in Hadera.

Several tonnes of the slimy creatures have been sucked in to the machinery of the plant, which uses sea water for cooling down. A number of workers at the plant have also reported being stung.

Scientists from Israel's Electric Corp warned that unless the problem is sorted out, cities around Israel could be without power, because once in the system the jellyfish diffused to become "gels".

"This gel blocks the condenser and interrupts the condensing of the steam. And in severe events, it might stop the power plant from producing electricity," said plant worker Nachum Plaumbaum.