Syria’s civil war is the world’s worst humanitarian crisis since Rwanda, and the United Nations says it is threatening to merge with increasing sectarian strife in neighboring Iraq and beyond.

UN High Commissioner for Refugees Antonio Guterres says 6,000 people flee every day, and his organization had “not seen a refugee outflow escalate at such a frightening rate since the Rwandan genocide almost 20 years ago.”

UN Assistant Secretary-General for Human Rights Ivan Simonovic says that at least 92,901 people have been killed in Syria between March 2011 and the end of April 2013.  That includes more than 6,500 children.

“The extremely high rate of killings nowadays, approximately 5,000 a month, demonstrates the drastic deterioration of the conflict," Simonovic told a rare public briefing of the Security Council.

But there’s growing bloodshed in Iraq, too, and it’s falling along the same “Sunni versus Shi’a” lines as Syria.  Iraqi armed groups are crossing over into Syria, not just to assist whichever side they’re allied with, but also to battle each other.  And now, the Pakistani Taliban has said its first batch of 120 fighters has arrived in Syria to fight alongside rebels battling the regime of President Bashar al-Assad

The deteriorating situation has Britain reportedly retreating from earlier plans to sell arms to the Syrian rebels, after being warned by military chiefs that it could embroil British forces in an all-out war.  The Obama Administration also appears to be far less interested in getting involved in Syria than it was earlier in the year.