Adds details from social media, background

May 28 (Reuters) - Jeff Bezos' space firm Blue Origin said on Thursday it experienced an anomaly during a hot-fire test, as visuals on social media showed its New Glenn rocket explode in a fireball.

A hot-fire test is where a rocket engine is fired up while anchored to the ground.

All personnel are accounted for, Blue Origin said in a post on X.

Blue Origin has spent billions of dollars and roughly a decade developing New Glenn, a rocket 29-stories high with a reusable first stage meant to compete with SpaceX's Falcon fleet and its more powerful Starship.

The Federal Aviation Administration did not immediately respond to a Reuters request for comment.