The large blasts today in Beirut are a serious problem.
With 24 dead and 174 wounded, it is one of the largest attack's of recent, and one of the worst attacks in the predominantly Shia area (and Hezbollah stronghold) of southern Beirut.
The conflict in Syria has attracted both Hezbollah and Iranian involvement in defending Syria's President Bashar Assad.
Many here in the region are saying this is a rebel payback for their support for Mr. Assad.
This attack is the first attack on an Iranian target, as the blasts occurred around the Embassy and the Iranian Cultural Attaché, Sheikh Ibrahim Ansari, was killed.
The scale of the devastation is large – and the operational success of the bombing will probably wind up spawning even more audaciously brutal actions.
A Sunni Al Qaida linked group based in Lebanon has claimed responsibility.
This same group has fighters on the ground in Syria with the rebels forces who are fighting the Iranian and Hezbollah backed Syrian government forces.
Lebanon is already such a fragile tinderbox of sectarian violence – this action will surely be met with retaliations – including those lead by Iranian operatives in Lebanon.
Sunni rebels are taking a pounding from Syrian Government forces right now – and Hezbollah forces are a part of that.
The Syrian army is carrying out a major offensive to cut off the rebels' last supply routes into Lebanon.
The pressure is on the rebels. Just a few days ago one of their main commanders died of injuries sustained from an air raid carried out by Assad's air force.
But the rebels are loosing key positions – and if their supply lines fall, it will be a hard hole to dig out of.
Brian Bush Middle East Coorespondent LeSEA Broadcasting