A Tweet sent at July 17, 2014 shortly after MH17 was downed states that the sender of the Tweet saw two missiles flying towards aircraft. The Tweet can be read here. A screenshot is shown below. The Tweet was sent at 13:29:01 UTC. The Flight Data Recorder and Voice Data Recorder of MH17 stopped recording at 13:20 UTC. So the Tweet was send 9 minutes after the BUK missile hit MH17.
The translation reads:
From the hill, in the direction of the side of Loetoegino, a few rockets flew, they overtook the planes (literally: the aviation). Then a loud noise. Something was hit.
Another source did the translation as well
“A pair of missiles flew out of (behind) the hill from the direction of Lutugino , chasing aviation. Then a loud rumble. Did they shoot down something or what ;(“
It is hard to tell what is meant with with the word авиация. It means aviation. It suggest multiple planes as for a single plane the word самолёт would be more likely.
The Tweet is hardly noted by MH17 researcher. A person nicknamed Slozny mentioned i 2016 the Tweet in a Russian forum.
This map shows where the missile hit MH17, where it was launched from, and where the eyewitness saw a few missiles flying.