Nasa halts moon rocket fuelling ahead of second launch attempt

Nasa’s moon rocket on Launch Pad 39-B at Kennedy Space Centre (Chris O’Meara/AP)

Nasa has halted the operation to fuel its new moon rocket after a hazardous leak was detected hours before lift-off.

For the second time this week, the launch team began loading fuel into the 322ft rocket, the most powerful ever built by Nasa, on Saturday morning.