A whole lot of instant condemnation and accusation of the rebels being responsible for the attack. Not much proof if any.
CHECK OUT VIDEO of terrorists leader Alexander Zakharchenko: He claims the attack on Mariupol and Debaltseve - (English)
https://en.informnapalm.org/zakharchenko-declared-attack-mariupol-debaltseve/
I guess the Easter Bunny did it.