LONDON (AP) — Three people have been seriously hurt by lightning as thunderstorms and torrential rain caused disruptions and flash flooding across the U.K.

Health officials say a man and a 5-year-old boy are in a life-threatening condition and a 7-year-old girl is seriously injured after they were hit by lightning during a school sports event in Lisburn, Northern Ireland.

In London, the Environment Agency said 35 millimeters (1.4 inches) of rain fell in one hour Tuesday as thunderstorms erupted following a spell of warm, sunny weather. The London Fire Brigade says firefighters helped three people escape after cars were trapped in 2 meters (6 ½ feet) of water in Wallington, in the city's south.

The fire brigade also said trees, billboards and telephone poles were set on fire by the lightning.