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4 suspects face court hearing in Hungary after deaths of 71 migrants in truck found in Austria

  • People light candles by a sign that reads "Europe: your hand is covered with blood" at Keleti railway station in Budapest, Hungary, Friday, Aug. 28, 2015, during a memorial for the 71 migrants who suffocated to death on the previous day in an abandoned truck on a main Austrian highway. (Tamas Kovacs/MTI via AP)

    People light candles by a sign that reads "Europe: your hand is covered with blood" at Keleti railway station in Budapest, Hungary, Friday, Aug. 28, 2015, during a memorial for the 71 migrants who suffocated to death on the previous day in an abandoned truck on a main Austrian highway. (Tamas Kovacs/MTI via AP)  (The Associated Press)

  • Two men, second right and centre rear, accused of being involved in the trafficking of the 71 migrants found dead in a truck in Austria, at a court in Kecskemet Hungary on Saturday Aug. 29, 2015. (AP Photo/Pablo Gorondi) HUNGARY OUT

    Two men, second right and centre rear, accused of being involved in the trafficking of the 71 migrants found dead in a truck in Austria, at a court in Kecskemet Hungary on Saturday Aug. 29, 2015. (AP Photo/Pablo Gorondi) HUNGARY OUT  (The Associated Press)

  • In this image taken from video a man one of the 4 accused of being involved in the trafficking of the 71 migrants found dead in a truck in Austria, arrives at a court in Kecskemet Hungary on Saturday Aug. 29, 2015. (AP Photo/Bela Szandelszky)

    In this image taken from video a man one of the 4 accused of being involved in the trafficking of the 71 migrants found dead in a truck in Austria, arrives at a court in Kecskemet Hungary on Saturday Aug. 29, 2015. (AP Photo/Bela Szandelszky)  (The Associated Press)

Hungarian prosecutors are asking a court to keep in custody four men detained in connection with the deaths of 71 migrants found in a truck in neighboring Austria.

Prosecutors in Kecskemet said they would request the preliminary arrest of the three Bulgarians and an Afghan at a closed-doors hearing Saturday in the central Hungarian city.

The truck with 71 dead migrants was found Thursday in the safety lane of the main Budapest-to-Vienna highway. The suspects were detained in Hungary later that day.

It wasn't clear how long the bodies had been inside the truck, which Hungarian prosecutors said set off from Kecskemet. Austrian officials say one of the suspects owns the truck and two others apparently took turns driving.

Hundreds of thousands of migrants have arrived in Europe this year.