Polish president killed in air crash near Russia's Smolensk - RT Top Rated Videos
A Polish journalist, who had flown into Smolensk an hour earlier, describes what occurred (before he is 'cut-off' mid sentence).
The TU154 was attempting to land at a military airport, it seems may not have been suitable for a limited visibility landing.
The crew had been advised by air traffic control to divert to Minsk, but (no doubt because of the time factor) nevertheless attempted to land at the military airport.