Lawyers for the sponsors of California's same-sex marriage ban have filed an emergency motion asking the U.S. Supreme Court to stop gay weddings, reported Associated Press.
The supporters of gay marriage say the federal appeals court "acted prematurely" by lifting an injunction which prevents the unions.
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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.