Chicago, Sep 20:  At least six people were rushed to hospitals after being injured when an explosion on Tuesday tore through the top floor of a Chicago apartment building, officials said.

The explosion at the three-story, 36-unit apartment building in the South Austin neighborhood occurred shortly before 9:30 a.m., officials said. Chicago Explosion: At Least Six Hospitalised After Blast in South Austin Building (Watch Video)

At least 10 ambulances were on the scene, according to the Chicago Fire Department, which requested help searching the structure.

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"Requesting manpower for searches in structure,” the department tweeted. China Creates New Wild Arctic Wolf Using Cloning; 'Maya' Becomes World's First Cloned White Wolf (See Pics).

No cause of the explosion had been determined. The department said in a series of tweets that the Chicago police bomb squad and agents from the federal Bureau of Alcohol, Tobacco, Firearms and Explosives were on their way as well.

The Fire Department conditions of three victims range from serious to critical. (AP)

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