It was barely more than a squiggle, but the mark of a single letter sprayed overnight on a wall in the heart of Islamic State's self-proclaimed caliphate was a daring act of dissent.
The next day, Islamic State fighters came and scrubbed out the "M" — the first letter of the word for "resistance" in Arabic — which appeared in an alley near the Grand Mosque in the Iraqi city of Mosul last month.
A video of the single letter, scrawled about a meter long on the wall, was shared with Reuters by an activist from a group called "Resistance," whose members risk certain execution to conduct small acts of defiance in areas under Islamic State rule.