Up to 50 people, presumed to be asylum-seekers, have been found dead in the back of a lorry in Austria.
Officials referred to the dead as migrants, and local media reports suggested they died of "suffocation" after being trapped in the lorry's trailer. A police manhunt has been launched to find the driver, who is suspected of smuggling the victims into the country.
The bodies were found in the back of a refrigerated food delivery truck, which had been parked on the hard shoulder of the A4 road, Austria's "Eastern Motorway", near the town of Parndorf.
A spokesperson for the Austrian interior ministry confirmed to the Reuters news agency that the tractor trailer had been found, but was unable to provide a definitive death toll. "Unfortunately there are many dead people in there," he said.
Police stand in front of a truck parked on the shoulder of the highway A4 near Parndorf south of Vienna
At least 20 migrants were found dead in the truck parked on the Austrian highway leading from the Hungarian border, police said.
'Today is a dark day'
Austrian police said the vehicle had been left abandoned at the site since Wednesday, but was only searched by officers on Thursday morning after it was repored by local workers.
They said there were between 20 and 50 bodies inside, and that they had been dead for some time and started to decompose.
Tweeting from the scene, Channel 4 News' Lindsey Hilsum said there was a "terrible smell of death as we passed".
Just drove past truck on A4 in Austria with 50 dead refugees inside. Terrible smell of death as we passed. pic.twitter.com/a2AiDnsy5V
— Lindsey Hilsum (@lindseyhilsum) August 27, 2015
Austria's interior minister Johanna Mikl-Leitner addressed the discovery of the lorry at a press conference in Eisenstadt, according to Krone.
She hit out at the "despicable methods" of migrant smugglers, saying they "belong behind bars", and said: "Today is a dark day." Macedonia/Greece Border Crisis
Earlier on Thursday, Austrian police said they had stopped three lorries suspected of carrying migrants. They included one van which had taken 34 refugees, including 10 children, across the border into Austria.
The incident comes as Europe faced a continent-wide migrant crisis, with neighbouring Hungary reporting 3,241 illegal entry attempts - a record number - on Wednesday.
Hungary is close to completing a razor-wire fence spanning the full 110-mile length of its border with Syria, prompting a race for migrants to reach the effective start of the Schengen Area of free movement within the EU.
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While the interior minister held her press conference, Austria's president Heinz Fischer was in Vienna for the Western Balkans Conference. The migration crisis was set to top the agenda at the summit between the EU and six Balkan states including Macedonia and Serbia.
