London, September 15: British Prime Minister Theresa May on Friday evening asked United States President Donald Trump not to “speculate” on London train attack that occurred at the Parson Green Underground station. The terror assault left 22 passengers injured today morning.

The reaction from Theresa May came hours after President Trump in his early-morning tweets suggested that the UK authorities had prior information of the perpetrators.

“I do not think it is helpful for anybody to speculate in an ongoing investigation. As I said, the police and security services have been working to discover the full circumstances of this cowardly attack and to identify all those responsible,” May commented on Trump’s tweet.

An Improvised Explosive Device (IED) detonated on a London Underground train station at around 8:20 am. The intelligence agencies including the MI5 is treating this as an act of terrorism. Hundreds of intelligence officials are investigating the case to find the person who dropped the bomb at the station during rush hours.

“The attack was intended to cause significant harm, and 22 people have been injured and are being treated in hospital,” May said while speaking to media.

Moments after the news started spreading across the world, US President sent several tweets including one in which he advocated his travel ban and another which said that “those involved in the attack may have been recruited on the internet”.

“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!” Trump said in one tweet.

“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!” Trump said in the second tweet.

“The travel ban into the United States should be far larger, tougher and more specific-but stupidly, that would not be politically correct!. We have made more progress in the last nine months against ISIS than the Obama Administration has made in 8 years.Must be proactive & nasty!” the third and fourth tweet of Trump said.

Scotland Yard also reportedly commented on Trump’s tweet saying that it was “unhelpful and pure speculation”.

There was no immediate claim of the attack and the authorities have given no details on possible suspects, but following some leads that attack was quickly labelled as a terrorist strike and security across the country was beefed up.

The BBC reported that the device had time, suggesting some degree of bomb-making knowledge was used in creating the device.

The emergency services said none of the injured faced life-threatening conditions.

London Mayor Sadiq Khan condemned the attack. “The hideous individuals who attempt to use terror to harm us and destroy our way of life. As London has proven, again and again, we will never be intimidated or defeated by terrorism,” he said.

In last one year, the United Kingdom has been the target of a string of Islamist-related terrorist attacks.