Dortmund (dpa / lnw) - police officers in Dortmund happened to witness a tangible relationship dispute. Officers stopped at a red light on Thursday when an angry woman got out of the car next to them, walked around the car and punched her 27-year-old friend, who was driving, through the open window. The forces arrested the 29-year-old despite fierce resistance. A police officer was injured by a kick from the woman and had to see a doctor. The 29-year-old was also found to have an alcohol level of around 1.7 per mille. The police said on Friday that they were being investigated for dangerous interference in road traffic, physical harm and physical assault on law enforcement officers.