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LONDON — The fundraising website collecting contributions for the family of the hero police officer killed in this week's London terror attack has refused to waive its 5 percent fee for collecting the money.

The Metropolitan Police Federation, which represents British police officers, had raised over £704,600 ($878,742) as of Saturday afternoon for the family of PC Kieth Palmer through crowdfunding website Just Giving.

This means the site — which takes 5 pence out of every pound for administration fees — will likely receive over £35,230 ($43,938) of the total sum.

Police Constable Keith Palmer. London Metropolitan Police via EPA

Just Giving confirmed they would not waive the 5 percent fee but said they had given a donation of £10,000 to the fund. They added that all the charitable causes they host online are "deserving".

It comes as police confirmed one man was still being held in connection with the attack, while nine of the 11 people arrested have been released with no further action, including two more let go Saturday.

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Police are trying to establish whether British attacker Khalid Masood — born Adrian Russell Ajao — acted alone.

The 52-year-old killed an American tourist, a police officer and two others outside the Houses of Parliament on Wednesday.

One women — a 32-year-old arrested in Manchester— has been released on bail until a date in late March, police said.

Officers confirmed that one man — a 58-year old — was still in custody under the Terrorism Act 2000 (TACT) after police arrested him Thursday in Birmingham.

Key Facts: Khalid Masood

Born Adrian Russell Ajao

He is British

He was born in Kent, a county east of London

He was 52-years-old

He had multiple aliases including Adrian Elms

Meanwhile, the Saudi Embassy in London told The Associated Press that Masood had spent time in Saudi Arabia between 2005 and 2006 and again between 2008 and 2009, teaching English.

Related: London Terror Attack: Khalid Masood Was Born Adrian Russell Ajao

He visited again for six days in March 2015, according to the AP.

The embassy also told the news agency that Masood had a work visa and wasn’t tracked by Saudi security services or have a criminal record in the country.

Key Facts: London Parliament Attack