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The tragedy of Lebanon has been unfolding for many months now, but the last week has seen an extraordinary new urgency to the violence. 

Gunshot on the streets is making some think back to the country’s decades long civil war.

The trigger for many was the enormous explosion at the port that killed more than 200 people in Beirut more than a year ago. 

Many were promised accountability, but that still hasn’t come.

Could Lebanon descend into a full-blown political crisis?

Newsnight’s Diplomatic Editor Mark Urban reports.