Khuram Shazad Butt and Rachid Redouane
While formal identification has yet to take place, detectives have named the two men Khuram Shazad Butt and Rachid Redouane who were both from Barking, east London.
The pair, along with a third attacker, were confronted and shot dead by armed officers within eight minutes of the first call on Saturday night.
Scotland Yard said Butt was a 27-year-old British citizen who was born in Pakistan.
Thirty-year-old Redouane claimed to be Moroccan and Libyan.
Inquiries are ongoing to confirm the identity of their accomplice.
Police guard the Borough Market attack scene
Detectives would like to hear from anyone who has any information about these men that may assist them with the investigation.
They are particularly keen to hear about places they may have frequented and their movements in the days and hours before the attack.
Butt was known to the police and MI5. However, there was no intelligence to suggest that this attack was being planned and the investigation had been prioritised accordingly.
Redouane was not known to the authorities.
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Police have named two of the men behind the Borough Market attack
A police spokesman said: “Work is ongoing to understand more about them, their connections and whether they were assisted or supported by anyone else. We cannot say more about them at this stage.”
Assistant Commissioner Mark Rowley said: “I would urge anyone with information about these men, their movements in the days and hours before the attack and the places they frequented to come forward.
“The police and our partners are doing everything we can across the country to help prevent further attacks and protect the public from harm.
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“At any one time MI5 and police are conducting around 500 active investigations, involving 3,000 subjects of interest.
“Additionally, there are around 20,000 individuals who are former subjects of interest, whose risk remains subject to review by MI5 and its partners.
“The security and intelligence services and police have stopped 18 plots since 2013, including five since the Westminster attack two months ago.
“We would urge the public to be vigilant and to report any suspicious activity to the police by calling us in confidence on 0800 789321 or in an emergency calling 999.”