NEW YORK (Thomson Reuters Foundation) - Smartphone users in the United States can try to help catch sex traffickers with a newly introduced app designed to identify hotel rooms where victims are held.<div><a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=oOeVc_UrKew:PQoaU0oh-5w:yIl2AUoC8zA"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?d=yIl2AUoC8zA" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=oOeVc_UrKew:PQoaU0oh-5w:V_sGLiPBpWU"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=oOeVc_UrKew:PQoaU0oh-5w:V_sGLiPBpWU" border="0" /></a> <a href="http://feeds.reuters.com/~ff/reuters/technologyNews?a=oOeVc_UrKew:PQoaU0oh-5w:-BTjWOF_DHI"><img src="http://feeds.feedburner.com/~ff/reuters/technologyNews?i=oOeVc_UrKew:PQoaU0oh-5w:-BTjWOF_DHI" border="0" /></a></div><img src="http://feeds.feedburner.com/~r/reuters/technologyNews/~4/oOeVc_UrKew" height="1" width="1" alt="" />