Cologne (dpa / lnw) - After a bloody crime involving two seriously injured young people in Cologne, the police are investigating the background of the events. During the night of Sunday, a 16-year-old was at times life-threatening and a 17-year-old was seriously injured. Video recordings are currently being evaluated to clarify the processes, a police spokesman said on Monday. A homicide detective is investigating an attempted homicide. Three suspects between the ages of 17 and 21 were taken into police custody. The teenagers suffered stab wounds in an altercation in front of a restaurant.