Danes find buried mortar rounds containing 'traces of blistering agent.
It doesn't really seem like a big deal since the shells seem to have been buried for at least ten years, hence built before the sanctions most likely from US component (more then likely). Plus the 'traces' part doesn't really make it seem like they were deployment either.
It's featured pretty prominently on the BBC front page, but I haven't seen anything on US web news sites yet.