Stabbing Attack at German Gym Leaves 4 Severely Injured

 Four people were severely wounded in a stabbing attack at a gym in the western German city of Duisburg, police said Tuesday evening.

No arrests were announced, and police said they were seeking one suspect. The motive of the attack was not immediately clear, ABC News reported.

The incident occurred in the old city of Duisburg and police asked residents to stay at home and avoid the area. They said a large number of officers were at the scene of the attack, right across from the city hall.

Three people were in life-threatening condition, and one person was less severely injured, Duisburg police tweeted. All four injured people are German citizen, police tweeted without giving any further details on their identities.