Following the leaks, Trump announced that the US Justice Department was launching a "complete review" on the leaks.
Trump ended his Twitter tirade by going after ESPN after a reporter at the sports network called the president a "white supremacist".
This isn't the first time British officials have criticized Trump's comments during a terror attack.
"Must be proactive!" Trump added, suggesting that British police was familiar with the attacker who perpetrated the attack and could have prevented it.
Trump concluded: "Must be proactive & nasty!"
And he argued that his administration has "made more progress in the last nine months against ISIS than the Obama Administration has made in 8 years".More news: Moon rules out nuclear weapons in South Korea
The terrorist behind the London Underground bomb attack this morning has been identified using CCTV footage, security sources told Sky News. In March, five people were killed and 40 injured near Parliament when a knife-wielding man went on a rampage, plowing a vehicle into pedestrians on Westminster Bridge, then stabbing a police officer to death. Even after judicial strike downs of Trump's proposed ban on travelers from several Muslim-majority countries, the president remains convinced that religious and ethnic profiling is the way to go.
Trump has repeatedly pointed to his travel ban as a cornerstone of his counterterrorism platform.
Sadiq Khan says the city "utterly condemns the disgusting individuals who attempt to use terror to harm us and destroy our way of life".
And a United Kingdom police spokesperson said Trump's commentary was "pure speculation given we don't know who is involved" and described his conjecture as "unhelpful".
Theresa May complained directly to Donald Trump after the USA president said on Twitter that the people behind a Friday bombing in London were known to British police, according to a United Kingdom government official familiar with the conversation.
Trump also called for the Internet to be "cut off" as a recruitment call for terrorists.
It certainly wouldn't be the first time Trump has criticized London's response to terrorist threats: Earlier in the summer, Trump had taken to Twitter to criticize London mayor Sadiq Khan's response to the attack in central London that killed seven. The very people carrying out a manhunt for the perpetrator of the attack also said Trump's comments only hurt the investigation.