"No go" for Discovery

Tonight's scheduled launch of the Space Shuttle Discovery was postponed earlier this afternoon when crews discovered a hydrogen fuel leak that had the potential to be "catastrophic". The launch was tentatively rescheduled for just before 9:00 p.m. (eastern time) tomorrow (Thursday).

A press conference should be held at any time now to discuss the status of Discovery's launch. You can follow the updates on NASA's website.