S&p 500 Pulls Back Slightly from Session Highs After Reports of Explosion at Istanbul Airport

Longer-dated U.s. Treasury Prices Add Slim Gains After Moody's Changes Outlook on 12 U.k. Banks, Building Societies Following Brexit Vote

Treasuries Close Nearly Flat Following Choppy Trading Day

U.s. Stocks Extend Gains, Nasdaq up 2.01 Pct

Brazil's Vescovi says Treasury Will Not Authorize Credit Line for Rio De Janeiro to Conclude Metro Line until State Pays Debts With Federal Gov't