A NASA scientist has told the Associated Press that social media reports of a meteor on the US east east seem to be consistent with the behaviour of a meteor shower.
Donald Yeomans, manager of NASA's Near-Earth Object Program in California, said: "it's unusual to have so many people see it."
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The Metropolitan Police Federation, which set up the official JustGiving site, said it felt a "suitable amount" had been collected.
There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."