Afghanistan President Hamid Karzai said: "Prime Minister Thatcher was one of the greatest leaders the world knew.”
He added that she would always be remembered in history as a strong leader who had truly served her country, particularly in strengthening the UK’s economy.
Karzai offered his condolences to the family, friends, relatives.
More top news
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."