Members of the Syrian opposition have accused President Assad of transferring chemical weapons to Hezbollah in Lebanon.
Backed by Iran, thousands of Shiites are playing a crucial supporting role for the Syrian regime and the worn-out Syrian Army.
Lebanon charged a sheikh who runs a militia with close ties to Syria and a Syrian intelligence officer in the mosque bombings, showing how far into Lebanon Syria can reach.
Syrian President Assad is likely to ride out a US attack that's designed to be limited.
After attacks in its Beirut stronghold, Hezbollah is trying to protect people with new measures – while also not disrupting their lives too much.
Today's car bombs in Tripoli targeted mosques led by pro-Syrian rebel clerics.
That's one theory. The distance the rockets were able to travel indicated use of a long-range weapon that only a local Al Qaeda-linked group is believed to have.
The day after the deadliest bombing since Lebanon's civil war, Hezbollah leader Nasrallah warned that violence has the potential to touch all Lebanese.
The blast, which was felt across Beirut, injured dozens and the death toll is expected to rise.
The group that kidnapped two Turkish pilots wants Turkey to pressure Syrian rebels to release a group of Lebanese pilgrims abducted last year.
Palestinians in Lebanon resent the additional competition for jobs and housing, already scarce because of discrimination.
Aid to Syrian refugees is ad hoc because of the country's rejection of formal Syrian refugee camps.
Lebanese Sunnis lack the military organization of their Shiite rivals and have a tradition of nonviolence.
Lebanon's economy typically rides a wave of tourism every summer, but Syria's war is scaring off visitors.
The EU has voted to blacklist only the 'military wing' of Hezbollah, allowing members to continue interacting with Hezbollah's political leaders.
Hezbollah has been expecting Sunni retaliation for its support for the Syrian regime. A slew of roadside bomb attacks shows it has begun.
I could understand the toothless Bedu lady's concern. Three lost sheep meant the ovine equivalent of up to $600 lost among the rocky crags of this central Lebanon wilderness.
The Shiite militant group has been waiting for retaliation in Lebanon for its role fighting alongside the Syrian regime.
With Sunni-Shiite tensions higher than ever because of war in neighboring Syria, it didn't take much to spark deadly fighting in the Lebanese city of Sidon. Hezbollah quickly jumped in.
The Lebanese Shiite militant organization once denied its involvement in Syria, but is now holding lavish public funerals for its fighters killed in action.
The Lebanese town Arsal, a Sunni stronghold surrounded by Shiite villages, is a haven for refugees and a weapons depot for rebel fighters. Its loss would be devastating.
Rebels abandoned the strategic city of Qusayr on Wednesday in a significant victory for Syria's Assad regime and a psychological blow to opposition forces.
For the Syrian rebels, Qusayr has been critical to bringing in weapons and fighters from Lebanon. But the regime and ally Hezbollah want the town, which lies at an important crossroads.
Israel, as well as Syria and its Lebanese-ally Hezbollah, has little interest in a wider conflict. But as Israel grows more assertive across its borders, the chance of a miscalculation is on the rise.
The Shiite militant group in Lebanon has sent drones over Israel in the past, linking their use to Israeli violations of Lebanon's airspace.