Oscar Pistorius is now at a relative's house with his family, after being granted bail today.
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A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
Brothers Jayden and Carlos Cortez, aged 1 and 2, were in their babysitter's car when it was stolen in California.
Officers said the girls were approached during separate incidents earlier this week in south London - possibly by the same suspect.