Two helicopters are believed to have crashed near Berlin's Olympic Stadium during a federal police exercise, leaving at least one person dead and several injured, German authorities said.
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The US president enjoyed rousing support for his political agenda as a formerly hostile audience cheered his plans in office to the rafters.
The former leader said the party needed to learn lessons after his successor Paul Nuttall failed to unseat Labour in a hard-fought campaign.
Toddler Harry Studley was left blind in one eye after Jordan Walters, 25, shot him in the head with an air rifle last year.