The AIDS world is reeling. Researchers, activists and officials were aboard Malaysia Airlines Flight MH17, which was shot out of the sky on Thursday; they were headed to the International AIDS Conference in Melbourne.
The nearly 300 passengers on the plane were all killed. Twitter users were among the first to report the loss of leading figures in the fight against AIDS, including Dutch researcher Joep Lange, former president of the International AIDS Society.
Here is how the story unfolded on Twitter.