More than a dozen wine bottles filled with flammable liquid and rags wrapped around them in the shape of molotov cocktails were found in the van.
In total, the cowardly attack in London Bridge resulted in the death of 8 innocent people.
Police also released images of the white Renault van, registration plate number HN66 TKX, used by the three men to carry out the attack.
Although the Islamic State group has claimed responsibility for the London Bridge attack, police have said there was no evidence that the perpetrators - Pakistani-born Briton Khuram Butt, Italian Youssef Zaghba and Rachid Redouane, who had links to Libya, Morocco and Ireland - were directed by anyone else, either in Britain or overseas.
"I can only assume they were part of trying to cause fear amongst people who came across them", the senior officer said.
The massive police probe into the attack continues and by today, 20 arrests have been made and 13 buildings searched.
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After crashing the van, they used 12in (30cm) pink ceramic knives tied to their wrists to attack passers-by.
Inspector Jim Cole, who was scrambled from his south London police station, said the response was "like something out of a Battle of Britain film" as officers piled into vehicles and raced to the scene.
Police appealed for any information around the knives - where they came from or where they were bought. The other two terrorists were not known to the police.
All three were carrying distinctive 12-inch bright pink ceramic knives, with leather strapping wrapped around the handle.
Each belt had three disposable water bottles covered in masking tape attached to them.
'On the radio, I could hear officers up at London Bridge and outside the Mudlark [pub] who were doing CPR and they were calling for ambulances urgently, ' he said. Six were still in custody on Saturday and one was released on bail.
Haydon said since last Saturday they had taken 262 statements from people from 19 different countries and numerous global inquiries were ongoing relating to the attackers and the victims.
Dick, who left the police to work in the Foreign Office in 2015 before taking up her new role, said the militant threat was largely domestic.
She said: "At the present time I do not regard what I have seen as an intelligence failure, but everybody would expect us to look at what has happened and to ensure that both we learn everything that we can, and that we improve and improve and improve".
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