Multiple people injured in German gym stabbing

Four people were severely wounded in a stabbing attack at a gym in Duisburg, Germany. The motive of the attack is not yet clear, and police are seeking one suspect. Three people are in life-threatening condition, and one person is less severely injured. The attacker is still on the loose, and helicopters are hovering above the gym. The gym chain expressed regret over the incident and is supporting the police investigation.