What two materials were cited as undergoing extreme thermal stress after the vehicle broke apart?

A large, cold piece of titanium structure versus a smaller piece of carbon composite

When investigating the physical consequences of a breakup, authorities need to track the specific materials that landed, as different fragments pose different risks. The analysis involves considering the nature of the debris pieces resulting from extreme thermal stress during descent. Specifically, fragments mentioned include large, heavy structural remnants, characterized as cold pieces of titanium structure, and smaller pieces of carbon composite that might retain significant heat upon descent. Differentiating between these materials helps inform risk assessment regarding potential secondary hazards, such as fire ignition on dry vegetation or structures, even if no direct human impact occurred.