1) Share this image on social media with a message
We launched the Yellow Ribbons of Hope campaign in May 2011 to mark 40 days and nights of Anton missing, aiming to raise awareness about him.
The colour symbolised our hope in times of darkness, and we are now using yellow ribbons again as we hope to find the truth of what happened to Anton.
2) Follow us on Facebook and Twitter
3) Share our social media posts
4) Use the hashtags #JusticeforAntonHammerl and #JusticeforAnton