Report from Breitbart Media, says it was caused by a chocolate factory.
Headline: "Watch: Panic as Lebanese River Runs Red".
http://www.breitbart.com/jerusalem/2018/02/28/watch-panic-as-lebanese-river-runs-red/
Whenever a river runs blood red it reminds people of the biblical prophecy.
https://www.youtube.com/watch?v=wCdsl89biZo
