Americans across the Midwest are waking up to the aftermath of a series of tornadoes which overturned cars and destroyed homes in at least six different states.
Illinois took the brunt of the fury, but parts of Indiana, Wisconsin, Michigan, Ohio and Kentucky were also damaged.
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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."