Blue Origin’s New Glenn mega-rocket just exploded during testing at a launch site in Cape Canaveral, Florida, according to live streams from NASASpaceFlight.com and SpaceFlight Now. Blue Origin later confirmed the explosion.

Jeff Bezos’ space company was performing a static fire test ahead of an anticipated fourth launch of the new rocket in the coming weeks, which was supposed to carry Amazon Leo internet satellites to space. Blue Origin said in an X post Thursday evening that “[a]ll personnel have been accounted for.” The company didn’t say what went wrong, only that an “anomaly” occurred. NASA, the Federal Aviation Administration (FAA), and the Space Force did not immediately respond to requests for comment.

The explosion likely means Blue Origin will have to pause the New Glenn rocket program for an extended period of time while it works through what went wrong. Blue Origin had been planning to attempt as many as 12 launches of New Glenn this year, after the company spent around a decade developing it in an attempt to compete with Elon Musk’s SpaceX.

The company is also supposed to help power NASA’s Artemis missions to the moon, with the agency highlighting Blue Origin’s expected role in that program earlier this week.