Brigadier Denise Beukes has distanced South Africa police from reports that fears of a burglary at the home of Oscar Pistorius may have led to this morning's fatal shooting.
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The unexploded bomb was found near the Houses of Parliament and led to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
Police said the incident in Melbourne, Australia, was terror related.