Members of the French armed forced are on patrol in metro stations and on busy streets in Paris this evening, following the arrest of a man over a series of gun attacks in the city earlier in the week.
The suspected gunman is believed to be behind four attacks around the capital. The motive for the attacks remains unclear.
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After a sweltering day, where temperatures reached a record high for July, the weather turned.
One of Britain's leading tour operators, Thomas Cook, has joined a growing push for changes to the way tourists receive security warnings.
Thunderstorms affect mostly southeast England on Thursday with a mixture of sunny spells and showers into the afternoon.