Germany increased security at some carnival processions on Tuesday after a local man ploughed his car into a parade in the western German town of Volksmarsen, injuring 52 people, including 18 children. The incident on Monday shook Germans still struggling to take in last week's racist gun attack on two bars in the town of Hanau which left 11 people dead. A spokesman for prosecutors suggested they did not see a political motive for Monday's tragedy when he said there was currently no indication the investigation would be handed over to national prosecutors. The driver, who had been detained on suspicion of attempted homicide, was being treated for his own injuries. The prosecutors' spokesman said he had not been in a fit state to be questioned overnight, but was not drunk at the time of the incident. Tests for drugs were due in the course of the day. While some carnival processions in the state of Hesse, home to Volksmarsen, were cancelled, others were due to take place in the region on Tuesday. A police spokesman said security would be intensified. Rose Monday is the height of the carnival season in Catholic areas of Germany, especially in the Rhineland where tens of thousands of people line the streets to watch decorated floats that often mock public figures. Thirty-five people were still in hospital on Tuesday, while another 17 had left hospital after treatment, police said on Twitter. Eighteen of the injured were children, the youngest of whom was three years old. Police, who had detained the driver, a 29-year-old German from Volksmarsen, said his motive was still unclear and investigations were ongoing. "There are so far no indications of politically-motivated criminality," Bild newspaper cited an investigator as saying. "But we think that the perpetrator acted with intent, and that psychological problems may have played a role," the investigator added.