The launch of space shuttle Endeavour was delayed at least until Wednesday due to a leak of hydrogen in the venting system used to carry excess hydrogen safely away from the launch pad, NASA said Saturday .

The earliest the shuttle could be ready to launch is June 17, NASA said in a statement today. The agency had set the official launch from NASA's Kennedy Space Center in Florida for today after completing a review of the shuttle on Wednesday.

NASA's mission managers will meet on Sunday to discuss the repair options and the Endeavour's launch opportunities because the launch of the Lunar Reconnaissance Orbiter/Lunar Crater Observation and Sensing Satellite is scheduled for the same date.

The Endeavor was set to launch for a 16-day mission that would go to International Space Station and include five spacewalks as well as the complete construction of the Japan Aerospace Exploration Agency's Kibo laboratory.

Astronauts will attach a platform to the outside of the Japanese module that will allow experiments to be exposed to space, NASA said in a statement.