The US Secretary of State Hillary Clinton has spoken to the Lebanese Prime Minister Najib Mikhail to condemn Friday's deadly car bombing.
She also offered US support in the investigation into the bombing, which some opposition politicians have blamed on Syria.
A spokeswoman for the US State Department said:
The secretary [Hillary Clinton] emphasised the United States' firm commitment to Lebanon's stability, independence, sovereignty and security.
She noted the importance of political leaders working together at this sensitive time to ensure that calm prevails and that those responsible for the attack are brought to justice.
There has been violence in the Lebanese capital Beirut today following the funeral of a security chief whose death many blame on Syria.
For the people of Beirut, Friday's car explosion is a bloody and terrifying throwback to the bad old days of civil war.