TOKYO, Sept 28 (Reuters) - Japan's Nikkei average fell below the 10,000 mark to its weakest level in two months on Monday, as a sharply stronger yen hit shares of exporters such as Honda Motor <7267.T> and after disappointing housing data fuelled worries about the strength of a U.S. recovery.
The benchmark Nikkei <.N225> touched 9,989.65, breaking below 10,000 for the first time since July 24 before rising back to 10,006.87, down 2.5 percent.
The index extended a 2.6 percent fall it booked on Friday.
The broader Topix <.TOPX> shed 2.3 percent to 901.18. (Reporting by Aiko Hayashi; Editing by Edwina Gibbs)