The executive of the National Districts city government, Fabio Ruiz Rosado, confirmed yesterday that Mayor Juan de Dios ("Johnny") Ventura has received a formal request from the U.S. Embassy to close off several streets surrounding the Embassy in Gazcue with a view of creating a security cordon around it. Ruiz Rosado refused to comment on the petition pending a report on its implications from the citys Urban Transit Department, headed by engineer Deligne Senci?n. The request could be quite tricky for the city to agree to, since the Embassy is on a major West-East artery and sits between the National Library and the Central Bank.