Olympic gymnast Louis Smith has tweeted about being awarded with an MBE this afternoon.
Chilling with my MBE on the palace steps think its frozen to my hand lol. Thanks for all your messages xx http://t.co/twyQhe6h
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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."