SOURCE -and about a bid to cover it up by bombing hospital treating Assad's victims, say U.S. officials
- U.S. officials level incendiary charge against Russia that it knew beforehand about the gas attack on Khan Shaykhun last week
- Officials are basing their conclusion on presence of a Russian drone which flew over a hospital as victims fled to get treatment
- Hours later a Russian-made fighter bombed the hospital which officials said they believe was an attempt to cover up the atrocity
- Unclear if jet was Russian or Syrian as Assad's forces fly Russian-made jets
- Local reports spoke about a 'Russian shelling' of a hospital; unclear if this is the one officials are referring to