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				Iran's Revolutionary Guards shot down the Ukraine International 
				Airlines flight on Jan. 8, 2020 shortly after it took off from 
				Tehran Airport in what Iranian officials said at the time was a 
				"disastrous mistake". 
				 
				In their application to the ICJ, also known as the World Court, 
				the four countries said Iran had violated "a series of 
				obligations" against the so-called Montreal Convention, aimed at 
				securing the safety of civilian air travel. 
				 
				They said Iran had failed to take all practicable measures to 
				prevent the downing of Flight PS752 and had failed to conduct an 
				impartial, transparent and fair criminal investigation and 
				prosecution. 
				 
				Most of the people killed in the crash were citizens of the four 
				countries, which created a coordination group aiming to hold 
				Iran to account.  
				 
				Iran says its forces accidentally shot down the Boeing 737 jet 
				at a time when tensions were high between Tehran and Washington, 
				and a final report issued in 2021 blamed a misaligned radar and 
				an error by an air defence operator. 
				 
				Canada at the time said the report made "no attempt to answer 
				critical questions about what truly happened". Ukraine called it 
				a cynical attempt by Iranian authorities to cover up the true 
				reasons for the crash, which it said it suspected was 
				intentional. 
				 
				(Reporting by Bart Meijer; Editing by Alex Richardson and Helen 
				Popper) 
				 
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