2. The following acts are and shall remain prohibited at any time and in any place whatsoever, whether committed by civilian or by military agents: (a) violence to the life, health, or physical or mental well-being of persons, in particular: (i) murder; (ii) torture of all kinds, whether physical or mental; (iii) corporal punishment; and (iv) mutilation;
(b) outrages upon personal dignity, in particular humiliating and degrading treatment, enforced prostitution and any form or indecent assault; (c) the taking of hostages; (d) collective punishments; and (e) threats to commit any of the foregoing acts.
The US is now violating this Article of the Geneva Conventions. US troops are taking hostages.
Atrios points this out and adds more details.