The tree was embedded in the front of the bus and emergency crews were using cutting equipment to gain access to one side of the vehicle.
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This year's poppy appeal is giving special emphasis to the plight of younger service veterans.
West Ham fans clashed with Chelsea supporters on Wednesday during an EFL Cup tie, a game which the Hammers won 2-1.
Only four pregnancies occurred during the trial - but reported side effects for men include acne, depression and increased libido.