The European Commission will make "key announcements" about the Gibraltar border issue within the next hour, a spokesperson said.
Olivier Bailly from the EU Commission said on Twitter that there would be "messages for both Spain and the UK" in a press conference at 1100 GMT:
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163,000 French and 143,000 German soldiers were killed in the 10-month battle in 1916.
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The fire broke out on Sunday morning at the home for 35 residents in Litochki, a village 25 miles north of Kiev.