Cologne (dpa / lnw) - In an argument in front of a Cologne restaurant, a 16-year-old was life-threatening and a 17-year-old was seriously injured. Both were taken to hospital on Sunday night with stab wounds, as the public prosecutor's office and the Cologne police jointly announced on Sunday. The 16-year-old was initially stable at noon after an emergency operation. The police took a total of three suspects between the ages of 17 and 21 into custody. It was initially not clear how many people were involved in the disputes in the Riehl district. A homicide detective has launched an investigation into an attempted homicide.