A severe thunderstorm swept over Western Australia Thursday morning striking four people with lightning, officials said.

As the storm shifted north, a warning was issued for the Perth metro area. There were 8,300 lightning strikes between 12 a.m. and 2:30 p.m. within a 372-mile radius of Perth.

The West Australian reports one person was struck by lightning at 4 a.m. in Mandurah. Half an hour later, another was struck in Baldivis. The third person was struck around 9 a.m. The fourth was admitted to Royal Perth Hospital just before noon for an indirect strike.

The stormy weather has caused delays at Perth airport, and by 9 a.m. about 22,000 homes were without power. The State Emergency Service received about 80 calls for help.

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