Nearly two months after an explosion sent flaming debris raining down on the Turks and Caicos, SpaceX launched another mammoth Starship rocket on Thursday, but lost contact minutes into the test flight as the spacecraft came tumbling down and broke apart.

This time, wreckage from the explosion was seen streaming from the skies over Florida. It was not immediately known whether the spacecraft's self-destruct system had kicked in to blow it up.

The 123-meter rocket blasted off from Texas. SpaceX caught the first-stage booster back at the pad with giant mechanical arms, but engines on the spacecraft on top started shutting down as it streaked eastward for what was supposed to be a controlled entry over the Indian Ocean, half a world away. Contact was lost as the spacecraft went into an out-of-control spin.

Starship reached nearly 150 kilometers in altitude before trouble struck and before four mock satellites could be deployed. It was not immediately clear where it came down, but images of flaming debris were captured from Florida, including near Cape Canaveral, and posted online.

"Unfortunately, this happened last time too, so we have some practice at this now," SpaceX flight commentator Dan Huot said from the launch site.

SpaceX later confirmed that the spacecraft experienced "a rapid unscheduled disassembly" during the ascent engine firing. "Our team immediately began coordination with safety officials to implement pre-planned contingency responses," the company said in a statement posted online.

Starship didn't make it quite as high or as far as last time.

NASA has booked Starship to land its astronauts on the moon later this decade. SpaceX's Elon Musk is aiming for Mars with Starship, the world's biggest and most powerful rocket.

Like last time, Starship had mock satellites to release once the craft reached space on this eighth test flight as a practice for future missions. They resembled SpaceX's Starlink internet satellites, thousands of which orbit Earth, and were meant to fall back down following their brief taste of space.

During the last demo, SpaceX captured the booster at the launch pad, but the spacecraft blew up several minutes later over the Atlantic. No injuries or major damage were reported.

According to an investigation that remains ongoing, leaking fuel triggered a series of fires that shut down the spacecraft's engines. The on-board self-destruct system kicked in as planned.

SpaceX said it made several improvements to the spacecraft following the accident, and the Federal Aviation Administration recently cleared Starship once more for launch.