The Homeland Security Department ordered border agents to verify that every international student who arrives in the U.S. has a valid student visa, according to an internal memorandum obtained Friday by The Associated Press. The new procedure is the government's first security change directly related to the Boston bombings. The order, which is effective immediately, came from a senior official at U.S. Customs and Border Protection, David J. Murphy. ... A Buffalo, N.Y., college has advised student-visa holders from Canada to add two hours to their daily commute. In an email sent to D'Youville College students, staff and faculty, International Student Office Director Laryssa S. Petryshyn said the security change "is causing and will cause numerous delays for all international students entering the United States." " - Associated Press, May 3, 2013.