Trump faces British backlash over Twitter comments on 'ongoing investigation'

President Donald Trump sounded off via Twitter on Friday morning after several people were injured in a reported London train terrorist incident, and is now facing British backlash over his rapid response.

A reported 18 people were rushed to the hospital on Friday after train passengers fled a car at Parsons Green underground station in West London. There was reportedly a blast on the car, and police have said they are treating it as a terrorist incident.

Trump potentially revealed a detail about the culprits involved in one of his morning tweets, saying the perpetrators were "in the sights of Scotland Yard."

"Another attack in London by a loser terrorist.These are sick and demented people who were in the sights of Scotland Yard. Must be proactive!" President Trump tweeted.

UK Prime Minister Theresa May was asked Friday about the U.S. president's tweet on the incident, to which she responded critically that it is "never helpful for anyone to speculate on what is an ongoing investigation."

Click through to read Trump's tweets about the London underground attack:

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Trump sounds off on London underground attack via Twitter
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Trump sounds off on London underground attack via Twitter
President Trump sounded off in bombastic terms on the London underground attack on Friday:
Another attack in London by a loser terrorist.These are sick and demented people who were in the sights of Scotland Yard. Must be proactive!
Loser terrorists must be dealt with in a much tougher manner.The internet is their main recruitment tool which we must cut off & use better!
The travel ban into the United States should be far larger, tougher and more specific-but stupidly, that would not be politically correct!
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The information Trump tweeted, if true, comes from the U.S. president before it has been announced by British officials -- a situation similar to when classified information was leaked in the U.S. press about the Manchester bombings.

Former chief off staff to May, Nick Timothy, also weighed in on the U.S. commander in chief's tweet, saying it was "unhelpful."

"True or not - and I'm sure he doesn't know - this is so unhelpful from leader of our ally and intelligence partner," Timothy tweeted.

Trump also used the Friday attack on London's underground to call for a "larger, tougher" travel ban.

"The travel ban into the United States should be far larger, tougher and more specific-but stupidly, that would not be politically correct!" Trump said.

The U.S. Supreme Court earlier this week ruled 5-4 in favor of lifting restrictions on Trump's ordered travel ban until further notice.

RELATED: At least 18 injured after London underground blast

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Terrorist blast on London underground train
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Terrorist blast on London underground train
An injured woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
LONDON, ENGLAND - SEPTEMBER 15: A police officer escorts an injured woman from the scene at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident as terrorism. (Photo by Chris J Ratcliffe/Getty Images)
LONDON, ENGLAND - SEPTEMBER 15: A police officer escorts an injured woman from the scene at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident and terrorism. (Photo by Chris J Ratcliffe/Getty Images)
Armed police officers walk through a carriage of a London underground tube train at Parsons Green station in London, Britain September 15, 2017. REUTERS/Hannah McKay
A woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
A man sits and waits in a London underground tube train at Parsons Green station in London, Britain September 15, 2017. REUTERS/Hannah McKay
A woman reacts outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers walk on the road near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
An injured woman is led away after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
People react near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police officers and sniffer dogs walk near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police officers stand on the road near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers escort members of the public out of their inner cordon as they work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. Police and ambulance services said they were responding to an 'incident' at Parsons Green underground station in west London on Friday, following media reports of an explosion. A Metro.co.uk reporter at the scene was quoted by the paper as saying that a white container exploded on the train and passengers had suffered facial burns. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
A woman walks with her dog past police cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Armed policemen stand outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Police officers escort members of the public out of their inner cordon as they work near Parsons Green underground tube station in west London on September 15, 2017, following an incident on an underground tube carriage at the station. Police and ambulance services said they were responding to an 'incident' at Parsons Green underground station in west London on Friday, following media reports of an explosion. A Metro.co.uk reporter at the scene was quoted by the paper as saying that a white container exploded on the train and passengers had suffered facial burns. / AFP PHOTO / Daniel LEAL-OLIVAS (Photo credit should read DANIEL LEAL-OLIVAS/AFP/Getty Images)
Members of the London Fire Brigade stand by cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
People stand by an ambulance near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Police vehicles line the street near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Members of a bomb disposal squad stand in the street near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
People speak with a police officer outside Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Kevin Coombs
Armed policemen stand by cordon near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
LONDON, ENGLAND - SEPTEMBER 15: The emergency services are seen near the police cordon at Parsons Green Underground Station on September 15, 2017 in London, England. Emergency services are investigating reports of an explosion at the West London tube station. (Photo by Chris J Ratcliffe/Getty Images)
An injured woman is led away after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
Staff from a local Italian restaurant hands out pizza and water from a stall near Parsons Green tube station in London, Britain September 15, 2017. REUTERS/Hannah McKay
Deputy Chief Constable Adrian Hanstock of the British Transport Police makes a statement to the media after an incident at Parsons Green underground station in London, Britain, September 15, 2017. REUTERS/Luke MacGregor
LONDON, ENGLAND - SEPTEMBER 15: A forensic tent is seen next to the stopped tube train at Parsons Green Underground Station on September 15, 2017 in London, England. Several people have been injured after an explosion on a tube train in south-west London. The Police are treating the incident as terrorism. (Photo by Chris J Ratcliffe/Getty Images)
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