Mitsotakis tweets support to families of Munich killings victims
'Let there be no more killing tonight', he tweeted
Greek PM Tsipras tweets in solidarity to German people on Munich massacre
Tsipras says violence should not be the future of Europe
18 y.o Munich killer was bullied as a child, German media report
Foreign media reports cite eyewitness accounts he shouted ‘Allahu Akbar’ before shooting