Vote in Abyei to be delayed, say northern officials, stoking fears of a return to conflict in Sudan. Greek police gas protesting public sector workers in Acropolis. Junta number two arrested in Niger amid rumours of a coup. Human rights groups refuse to appear before Sri Lanka war crimes commission. 23 Bahraini Shias charged with anti-state activities in run up to parliamentary elections. All this and more in today's security briefing.