Today's bombing on the Iranian Embassy in Beirut is the first attack in Lebanon to target Iran for its backing of Syrian President Bashar al-Assad in the civil war.
Today's car bombs in Tripoli targeted mosques led by pro-Syrian rebel clerics.
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.
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 Shiite militant group has been waiting for retaliation in Lebanon for its role fighting alongside the Syrian regime.
France said today it has confirmed that the nerve gas sarin was used by the Syrian regime. Britain later said it had found evidence of sarin as well.
The Syrian Observatory for Human Rights said 30 people, including 16 rebel fighters and one woman, were killed in Qusair in morning fighting, but that the death toll was expected to rise.
British journalist Rupert Shortt documents and examines the persecution of Christians around the world – a problem of which many Westerners are unaware.