Penn fire and emergency services chief Eugene Janda says the blaze does not appear to have been accidental.
Crowds of students who live in Rodin waited in the Harnwell and Harrison College House lobbies for two hours until they were allowed to return to their rooms. No injuries were reported.
A school official says water damage occurred on floors 20 through 22.
The Philadelphia fire marshal is investigating.
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Information from: The Daily Pennsylvanian, http://www.dailypennsylvanian.com
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