Both were held on suspicion of terror offences in raids on separate addresses in east London.
The three Islamists who killed eight people after driving a van into pedestrians on London Bridge and then attacking nearby revellers had initially tried to hire a 7.5 tonne truck, the head of the United Kingdom capital's counter-terrorism unit said on Friday.
All three of the attackers wore the leather belts which each had three disposable water bottles covered in masking tape attached to them.
"I can only assume they were part of trying to cause fear amongst people who came across them", the senior officer said.
Funds will go to the charity's UK Solidarity Fund, which was launched in response to the Manchester Arena and London Bridge attacks. He then went on a stabbing spree along with Rachid Redouane, 30, of Moroccan and Libyan descent and Moroccan-Italian Youssef Zaghba, 22, in Borough Market.
Police in England made another arrest on Saturday after releasing additional details about the recent London Bridgeterrorist attack. "So we need, for example, people who are hiring vans and lorries out to just think about who these people are and if you have any concerns at all to contact us on the anti-terrorist hotline".
They leave in the van, heading for central London.
Since the attack, 20 people have been arrested, with 13 buildings searched.
The city "carries on" and people should feel reassured by the increased police presence on the streets, Metropolitan Police Commissioner Cressida Dick said.
Officers also released images of three ceramic pinkknives, found either near or on the attackers.
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In the back of the van used in the attack, officers also found wine bottles filled with flammable liquid with rags tied to their necks, along with blow torches to light them.
After leaving the small white van, the men used 12-inch knives with bright pink blades, according to Dean Haydon, head of the Metropolitan Police's Counter- Terrorism Command.
Police appealed for any information around the knives - where they came from or where they were bought.
After his payment was declined, Butt and his two accomplices rented a smaller van that they used to plough into crowds before they went on a stabbing rampage in an attack that left eight people dead and almost 50 people injured.
Police said Khurum Butt, the ringleader, made a booking with a haulage company, but the rental was cancelled when he failed to make the payment on time.
London remains one of the safest cities in the world, the capital's top police officer declared, while warning people to remain vigilant amid the continued terror threat.
Cole, 41, said the attack was "the most challenging, most intense situation I've dealt with" in an 18-year police career.
Ms Dick said the threat to London and the United Kingdom is one many other countries are facing and remained defiant when asked about the future.
"There was no evidence uncovered of any attack-planning in relation to him", Haydon said.
"When we got there, there were a number of armed officers and there were casualties on the pavements", Inspector Cole said.
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