French satirical newspaper Charlie Hebdo has released a special edition to mark the 10-year anniversary of an attack on its offices by Islamist gunmen. The edition features a cartoon celebrating the paper's existence and showcases the results of a caricature contest to mock God and religious leaders. The attack in 2015 left 12 people dead and was said to be revenge for Charlie Hebdo's decision to publish caricatures of the Prophet Mohammed. The special edition will go on sale on Tuesday, coinciding with public commemorations by President Emmanuel Macron and Paris Mayor Anne Hidalgo.