Rates inched lower Tuesday as concerns about possible US military involvement in Syria hurt stocks and boosted mortgage-backed securities. In economic news, the June S&P Case-Shiller 20-city home price index rose 0.89% from May and was 12% higher than one year ago. Consumer Confidence increased unexpectedly to 81.5 from 80.3. A slight decrease had been forecast. Results from today’s 2-year Treasury auction will be released at 1:00 PM.