The White House has called on Syria to intensify their efforts to remove chemical weapons from the country so they can be destroyed.
Defence Secretary Chuck Hagel said the US is "concerned" that Syria is behind in removing chemical weapons material that are due to be destroyed under an international agreement.
Hagel said he had asked Russian officials to urge the Syrian regime to comply with the deal.
Despite the delay, Hagel believes the removal effort could get back on track.
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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."