German authorities yesterday scrambled to determine the motives of a man who ploughed his car into a carnival procession, injuring dozens and further unsettling a country rocked by a fatal mass shooting last week. Investigators said the 29-year-old German driver had not been drunk at the time of ramming on Monday, but could not yet rule out that he was under the influence of drugs, national news agency DPA said. The ramming, which injured 52 people, including 18 children, comes just days after a gunman with suspected racist motives killed nine people with migrant backgrounds in Hanau, also in western Hesse state. The driver was also injured himself and couldn't be questioned.