Small plane hits Milan building Smoke rises from the Milan skyscraper. A small airplane crashed into a government building in heart of Milan, setting the top floors on fire, Italian police reported. There were no immediate reports on casualties as rescue workers attempted to clear the area in the city s financial district. Few details of the crash were available, but news reports about it immediately set off fears that it might be a terrorist act akin to the Sept. 11 attacks in the United States. Those fears sent U.S. stocks tumbling to session lows in late morning trading. WITNESSES REPORTED hearing a loud explosion from the 30-story office building, which houses the administrative offices of the local Lombardy region and sits next to the city s central train station. Italian state television said the crash put a hole in the 25th floor of the Pirelli building. News reports said smoke poured from the opening. Police and ambulances rushed to the building in downtown Milan. No further details were immediately available. Check back for additional details on this breaking story. The Associated Press and Reuters contributed to this report.