The official said the Times Square detail was a small part of the wide-ranging information the younger Mr. Tsarnaev has communicated to investigators over days of questioning that began after his capture in Watertown, Mass.

WSJ: Times Square Was a Target, Officials Say

"The United States communicated to the Iranians that we will continue to conduct surveillance flights over international waters consistent with long-standing practice and our commitment to the security of the region, " Mr. Little said.

WSJ: U.S. Fighters Warned Off Iranian Jet