Israel's prison service has said it has begun the process of releasing 26 Palestinian prisoners ahead of peace talks.
The prisoners form the first of four groups totalling 104 that Prime Minister Benjamin Netanyahu's cabinet last month agreed to free in a step aimed at renewing negotiations.
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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."