VALLETTA, Malta – British Prime Minister David Cameron announced funding for a Commonwealth counter-extremism unit as the organisation’s summit in Malta got underway on Friday. Cameron – who joined other heads of government from the 53-country gathering for the first of three days of talks on the Mediterranean island – said sharing expertise would help defeat the “extremist scourge”. Combating radicalisation and extremist violence is one of the main issues expected on the table at the biennial summit.