The shooting of an injured Afghan insurgent was filmed by a camera mounted on the helmet of Marine B.
Marines B and C were alleged to have been ''party to the killing'' and ''encouraged and assisted'' Marine A in committing the murder, but they were cleared.
The sentencing hearing in relation to Marine A, who has been named as Sergeant Alexander Blackman, is due to take place tomorrow.
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The slump will spark scrutiny, especially as statistics show a rise in racially or religiously motivated offences following the EU vote.
The 53-year-old was killed shortly after leaving her home in Mosta, Prime Minister Joseph Muscat said.
Jordi Sanchez of the Catalan National Assembly and Jordi Cuixart of the Omnium Cultural group were jailed on Monday.