With markets closed for Good Friday, the Dow Jones industrial average ended the shortened week down 28 points, closing at 10,442. The last day of trading started on a strong note, with solid earnings reports from General Electric and other blue chips. But ongoing violence in Iraq, warnings of bombs on Paris trains and Condoleezza Rice’s appearance before the 9/11 Commission kept the bulls at bay. On the Nasdaq, Yahoo!’s shares rose 16 percent to close last Thursday at $56.21, following news that its first-quarter net income doubled on revenue of $758 million. The company plans to split shares of its common stock on May 11. On the Big Board, Omnicom shares declined 1.6 percent to close the week at $81.18, while IPG’s stock price rose 2.3 percent to $16.26. WPP, trading as American Depository Receipts on the Nasdaq, gained 1.0 percent to finish at $52.90.