At the press launch of 'Viva Forver', Geri Halliwell said the musical supports Girl Power's longevity. "Who would have thought the message is still standing 16 years later".
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A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
A search is underway for two brothers, aged 1 and 2, who 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.