Energy stocks lead Wall St lower in broad retreat

By Sinead Carew NEW YORK (Reuters) - Energy shares led a broad decline on Wall Street on Monday in the wake of a drop in crude prices to fresh 5-1/2 year lows amid concerns economic problems elsewhere in the world could hurt the United States. The S&P was set for its first four-day losing streak since December 2013 as crude oil futures prices dropped to their lowest since May 2009 amid a global supply glut and lackluster demand. Russia's oil output hit a post-Soviet high last year, and