On May 21th a video was recorded from the Ukrainian checkpoint between between Olginka & Blahodatne:
Today in the morning at 4:50 they were attacked by a group of 20 men. The battle lasted for 15 minutes.
This is the result shortly after the attack filmed by a driver passing the scene. Notice there is only one ambulance and very little people around.
After a while some helicopters come in for assistence. Notice that when they arrive the smoke is already there, indicating that they arrive AFTER the attack.
In the helicopter video a big explosion can be seen.
Just a little bit later than the previous video but before the big explosion a soldier who is hiding at the scene starts filming:
At the end of this video it can be seen that there are two ambulances any many people walking around. Therefore this happened at a later stage.
This is a soldier giving a report on what happened:
In the end 16 people died and 30 were wounded.
Again: this is why it is so dangerous to film Ukrainian positions!!!
Yesterday #terrorists near #Volnovakha carried out exploration & today they attacked on #ukrainian servicemen http://t.co/IB08tU47QG | EMPR
In this video rebels admit and tell they attacked the checkpoint.
— Euromaidan PR (@EuromaidanPR) 22 mei 2014
Also see: video break down of helicopter attack.
Must read: the helicopter attacked the green van while still looting.