From The Straits Times:
…a message on the official Twitter account of the Donetsk People’s Republic had announced hours earlier that insurgents had seized a series of Russian-made Buk systems capable of soaring to that height.
“@dnrpress: self-propelled Buk surface-to-air missile systems have been seized by the DNR from Ukrainian surface-to-air missile regiment A1402,” said the post.
That tweet was later deleted as well.
Read more at Malaysia Airlines MH17 crash: Deleted posts suggest Ukraine rebels downed jet in error.