Spanish unemployment figures released today show a record 27.2% are out of work.
French unemployment figures are released later and are also expected to break all recent records.
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Among those murdered was Keith Palmer, an unarmed constable who "did his job and never wanted any fuss."
Top temperature 14 Celsius (57 F).
The Prime Minister will say Moscow's brazen flouting of international law represents a threat to the basis of democracy across Europe.