Originally published by the Voice of America (www.voanews.com). Voice of America is funded by the US Federal Government and content it exclusively produces is in the public domain. NASA Delays Shuttle Launch -------------------------- (http://enews.voanews.com/t?ctl=E2E4C2:3919ACA Space agency says problem is with one of four engine cut-off sensors in external fuel tank Shuttle Discovery on launch pad (File photo) The U.S. space agency has called-off Wednesday's scheduled launch of the space shuttle Discovery  because of a faulty fuel-tank sensor. NASA has not announced a new launch date. NASA officials say they have not ruled out trying Thursday. They say they have a two-week window to try again. The agency said the problem was with one of the four engine cut-off sensors in the external fuel tank. The launch of Discovery  will be the first U.S. space flight since the space shuttle disaster two-and-a-half years ago. NASA grounded its entire shuttle fleet in February 2003 after the shuttle Columbia broke up in mid-air on its return to Earth, killing all seven astronauts on board. Some information for this report provided by AP and AFP.   .