British officials are expressing frustration with President Trump's response to a terror attack in London on Friday, calling his comments "unhelpful."

Trump tweeted early Friday after an explosion at a London train station, claiming the "loser terrorist" behind the attack was "in the sights of Scotland Yard."

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U.K. officials have not yet released information on the suspect or whether they were on law enforcement's radar.

Nick Timothy, a former chief of staff to Prime Minister Theresa May, said Trump's speculation is "unhelpful from a leader of our ally."

"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.

True or not - and I'm sure he doesn't know - this is so unhelpful from leader of our ally and intelligence partner. https://t.co/ZndrTXFrAX — Nick Timothy (@NickJTimothy) September 15, 2017

A U.K. police spokesperson also characterized Trump's early morning tweets as "unhelpful."

"Pure speculation given we don’t know who is involved ... Any speculation is unhelpful," the spokesperson told CNN and BuzzFeed.

A U.K. police spokesman tells CNN this is "pure speculation given we don’t know who is involved." "Any speculation is unhelpful.” https://t.co/YrfCjetfB8 — Kaitlan Collins (@kaitlancollins) September 15, 2017

The explosion at a subway station in southwest London early Friday is being treated as a terrorist attack by local law enforcement.

Multiple injuries, including facial burns, were reported following an explosion in southwest London early Friday morning. The explosion happened about 8 a.m. local time at Parsons Green train station.

Trump fired off a series of Tweets using the attack to advocate for his executive order barring travel into the U.S. from Muslim-majority countries.

"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 continued in a subsequent tweet.

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