Seething anger in Bangladesh's army over a deadly mutiny by border guards could boil over into bloody revenge, threatening further instability in a country only recently returned to democracy, analysts warn. At least 76 corpses of mainly senior army officers have been recovered so far in shallow mass graves and stuffed into drains and sewers at the headquarters of the Bangladesh Rifles (BDR) in the capital Dhaka. Many of the dead had been shot and mutilated, according to rescue workers, and as many as 72 officers were still missing in the wake of the 33-hour revolt which ended late Thursday. Ataur Rahman, a professor of politics at Dhaka University, said the impoverished South Asian nation had a tradition of revenge attacks and more violence could ensue. That would pose a serious challenge for Prime Minister Sheikh Hasina, who won December elections after two years of army-backed rule, he said.