BRUSSELS - Ukrainian authorities on Thursday declared the east of the country a no-fly zone after a Malaysian airliner carrying 295 people crashed in the volatile region, European flight safety body Eurocontrol said.
European and US airlines rerouted their flights as Kiev said the Malaysia Airlines (MAS) flight MH17 was shot down in a "terrorist" attack and a US official said intelligence analysts "strongly believe" it was downed by a surface-to-air missile.
"Since the crash, the Ukrainian authorities have informed Eurocontrol of the closure of routes from the ground to unlimited (altitude) in Eastern Ukraine," a statement said.
"All flight plans that are filed using these routes are now being rejected by Eurocontrol. The routes will remain closed until further notice," it added.
According to Eurocontrol's information, the doomed plane was flying at a level known as "330", or approximately 10,000 metres or 33,000 feet, when it disappeared from radar screens.
The route itself had been closed to level "320" but was cleared for those flying at MH17's altitude.
In Paris, a statement by junior transport minister Frederic Cuvillier said French carriers should "avoid Ukraine's air space as long as the reasons behind this catastrophe are not known".
The Boeing 777 dropped off the radar at around 1415 GMT (10.15pm Malaysian time) and crashed in a border region held by pro-Russian separatists.
Ukrainian President Petro Poroshenko pointedly called the disaster a "terrorist act", and major airlines quickly announced plans to route planes away from the area.
Air France said it decided "to no longer fly over eastern Ukraine as soon as it heard of the event", and Alitalia had done the same.