The flydubai Boeing 737, which took off from Dubai, exploded into a fireball on Saturday after missing the runway in southern Russia while making a second attempt to land in heavy wind and rain.

“The airport is now fully functional,” an airport representative told AFP.

On Sunday, officials said workers finished clearing the runway of debris, which investigators said had been scattered up to 1.5 kilometers (one mile) away from the crash site.

Outbound flights resumed at around 0630 GMT on Monday, but incoming flights to the city of one million people were still either cancelled or delayed.

Investigators have launched a criminal probe into whether poor weather, a pilot error or a technical fault were behind the crash, which killed all 55 passengers and seven crew members on board, including nine different nationalities.

The plane’s two black boxes were recovered from the crash site but were “badly damaged,” Russia’s intergovernmental aviation committee said, AFP reported.

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