Of course there is.
The attack was reported by Ukraine's foreign minister Leonid Kozhara at the time, and later confirmed by Poland's foreign minister Rado Sikorksi, who was in Kiev when it happened.
“The attack was reported....”
Oh yeah, the attack on Yanukovych was reported, and it was even video recorded:
https://www.youtube.com/watch?v=IE7SkSklXcQ