Manhunt Underway Following London Subway "Terrorist Incident"; Police Call Trump Reaction "Unhelpful"

President Donald Trump waves as he arrives at the White House Thursday Sept. 14 2017 in Washington

Trump used the terrorist attack to revive his push for a travel ban for people from predominantly Muslim countries, an effort that has been hampered by USA courts.

After Friday's attack, which injured more than 20 people, Trump tweeted that the "sick and demented" terrorists must be "dealt with in a much tougher manner".

May also rebuked Trump following a meeting of the Government's Cobra emergency committee, according to the Independent, saying: "I never think it's helpful for anybody to speculate on what is an ongoing investigation".

In ensuing tweets, Trump quickly turned to the matter of his "travel ban", skipping the usual condolences offered to victims of the attack or promises of American assistance and instead touting his own (unconstitutional) policy.

The prime minister, Theresa May has condemned the "cowardly" Parsons Green attack, she has hit back at President Trump, as he tweeted that the bomber was "in the sights" of the police.

President Donald Trump responded in a series of tweets, which were not received positively by London authorities.

They are losers. And we will have more of them.

Police are conducting a manhunt for the main suspect, yet to be named, in the attack.

The London Ambulance Service says 18 people have been taken to hospitals with injuries, but none were thought to be in a life-threatening or serious condition.

"We're losing a lot of people because of the internet", Trump said then.

President Donald Trump is defending his travel ban.

"It just keeps going and going, and we have to be very smart, we have to be very, very tough", the President said. While British authorities are treating the incident as a terrorist attack, they have not yet determined who may be responsible for the bomb or what their motives were.

Trump also took the opportunity to push his proposed travel ban against several Muslim-majority nations, which has been tied up in court.

At least 29 people were injured in the attack after a device in an Lidl bag was trigged by a timer and partially exploded.

At the time UK Prime Minister Theresa May said, "I will make clear to President Trump that intelligence that is shared between our law enforcement agencies must remain secure".

Trump administration officials are also reviewing what new vetting procedures for travelers should be put into place, including requiring visa applicants from some countries to submit to checks of their social media accounts.

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