(CNN) Police in the German town of Volkmarsen have arrested a 29-year old man, after a car plowed into a crowd of people at a parade on Monday and left at least 30 injured.

Police said that the suspect, a German citizen from Volkmarsen, was receiving medical treatment for "the injuries he suffered in connection with the incident" and would be brought before an investigating judge when his health allows.

A police spokesman said earlier that according to eyewitness accounts, the car "intentionally" rammed into the crowd of carnival celebrants at around 2.30 p.m. local time (8:30 a.m. ET).

Police and rescue workers at the scene of the incident at Volkmarsen's Rose Monday parade.

The spokesman could not confirm the driver's motive for the incident.

The interior ministry of the federal state of Hesse said in a statement that the suspect ''drove at high speed." It added that the man in the custody ''is currently not interrogatable."

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