At least 25 people were hurt in an explosion in Wuppertal, Germany, police said Sunday.

According to The Associated Press, four victims were hurt "severely" in the blast and ensuing fire late Saturday at a "several-story building." The other victims suffered slight injuries, the AP reported.

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"It can currently not be ruled out that there are still other people in the building," police said Sunday, according to Deutsche Welle. "The rescue efforts are ongoing."

Authorities are looking into what caused the blast, the AP reported.

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Scott Jackson (right), business service consultant for WorkSource Fulton, helps job seekers with their applications in a mobile career center at a job fair hosted by Goodwill Career Center in Atlanta. (Ziyu Julian Zhu/AJC)

Credit: Ziyu Julian Zhu/AJC