Two men who were found in a car after they were stabbed to death have been named as Aaron Carriere and Josiah Manful.
No one has been arrested and police are appealing for witnesses to come forward. Any one with information can call the incident room on 020 8345 3715 or Crimestoppers anonymously on 0800 555 111.
More top news
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.