It was again hydrogen leak problem that forced the US space agency NASA (National Aeronautics and Space Administration) to call off the scheduled Saturday launch of its space shuttle Endeavour, which was to fly to the International Space Station (ISS).

NASA reported that the hydrogen leak, which developed while fueling the space shuttle, was detected timely. The NASA spokesperson Allard Beutel told that engineers detected a gaseous hydrogen leak in ground support equipment while the shuttle was being fueled with a half-million gallons (1.9 million litres) of liquid oxygen and liquid hydrogen.  
 
The Space Shuttle Endeavour was to be launched with its seven-member crew, at 7:17 a.m. EDT (1117 GMT) from the Kennedy Space Center in Florida. Endeavour was to fly to the ISS to deliver the final segment of Japan's huge space station lab, dozens of spare parts for the 100-billion-dollar orbiting outpost, laboratory racks, experiments, supplies, and more than 600 pounds of food for the six men living there.
   
The crew of Endeavour was slated to spend 12 days at the ISS to conduct five spacewalks to set the porch, replace batteries and do a number of maintenance tasks.