A huge cluster of jellyfish has forced one of the world’s largest nuclear reactors to shut down – a phenomenon that marine biologists say could become more common.

Swedish police say they have released two sabotage suspects arrested in an explosives scare at a nuclear plant.

Authorities sealed off a nuclear plant in Sweden after a welder arrived for work with a plastic bag containing traces of an explosive substance, police and plant officials said.

A deadly strain of bird flu has been found in wild birds in southern Sweden, authorities said today.