Lebanon's health ministry said five people have been killed and 20 injured in Beirut.
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The US president and British prime minister discussed China, Brexit and Russia at a breakfast meeting in Biarritz on Sunday morning.
It will be a hot one across the UK with temperatures peaking in the south east with highs of 33 Celsius.
Restrictions on the amount of liquids passengers can take on planes could be eased if new technology is successful.