(CNN) President Donald Trump on Tuesday again seized on what he called a "terrorist attack" in London to call for tougher anti-terror measures, even though the incident was still in the early stages of investigation.

"Another terrorist attack in London...These animals are crazy and must be dealt with through toughness and strength!," the US President tweeted

Metropolitan Police in London were investigating the event -- in which a car crashed into security barriers outside of the Houses of Parliament during rush hour Tuesday morning -- as a terrorist incident. The driver, a man in his late 20's, was arrested at the scene on suspicion of terrorist offenses. He was alone in the car and no weapons were recovered at the scene.

Two people were taken to the hospital and one person was treated at the scene of the crash.

Neil Basu, Assistant Commissioner Specialist Operations at the Metropolitan Police, said that the incident "appears to be a deliberate attack" and officers from the Counter Terrorism Command are leading the investigation. Police are working to establish the identity of the suspect and his motivation. He said the suspect was not being cooperative.

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