BOSTON (CBS) – President Donald Trump praised Boston Mayor Marty Walsh and police following a massive counter protest to a so-called “free speech” rally on Boston Common Saturday afternoon.

He even had some words of praise for the protesters.

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Photos: Boston Free Speech Rally And Counter Protests

Police Commissioner Bill Evans said there were about 40,000 people at the demonstrations.  A total of 27 people were arrested according to Boston Police.

Walsh replied to the president’s final tweet about Boston less than an hour later.

There were no serious injuries reported, despite some protesters scuffling with police as the demonstrations ended.

No major property damage was reported either.

Protesters face off with riot police escorting conservative activists following a march in Boston against a planned ‘free speech rally’ on Boston Common, on August 19, 2017. (Photo by Spencer Platt/Getty Images)

The Free Speech Rally participants left Boston Common with a police escort about 45 minutes after the event began.

One of the planned speakers said the rally “fell apart.”

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Trump and Walsh have had a tumultuous relationship. In 2015, Trump called Walsh a “clown.”