Do not discuss this topic on Twitter, Facebook, Youtube and other Silly-con valley sites. Many have been suspended or banned already.
U.S. Army Lieutenant General Roger L. Cloutier has allegedly been captured by Russian forces in Mariupol.
The Elensky regime sent two helicopters in a second attempt to rescue individuals among the remaining trapped Ukraine Army and Azov. Both were shot down before they could land. It is rumored that many NATO military officials are among the trapped combatants.
They are mostly articles which describe the existence of the rumor, which appears to be widespread on Russian social media.
Southfront also mentioned the rumors and IMO this is strongly suggestive that it is true.