I see more pic here:
http://dozor.kharkov.ua/photo/army/1150937.html?photo=p30781
http://hosted.ap.org/photos/7/7c3a9e8c-823c-417d-9c56-bfa0d797c14b-big.jpg
http://hosted.ap.org/dynamic/files/photos/1/17165b4e-0a73-4eaa-9b92-98002afdc6a4.html?SITE=AP&SECTION=HOME&TEMPLATE=DEFAULT
they say powerful explosions, the video with the 2 helicopters show powerful explosions, looks like the 2 helicopters did this