A Taliban suicide bomber detonated himself outside Kabul International Airport, killing three foreign advisers and an Afghan interpreter, police said. A Taliban spokesman, Zabihulllah Mujahid, claimed responsibility for the attack.
In this successful attack up to 15 invader soldiers were killed or wounded and many vehicles were 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."