U.S. Secretary of State Condoleezza Rice has criticized Syria for creating instability in Lebanon, where a second politician was killed Tuesday.
Ms. Rice said she does not know who is responsible for the attack that killed George Hawi in Beirut, but she called on Syria to end destabilizing activities there.
Ms. Rice spoke to reporters aboard a plane to Brussels, where she is to attend a conference aimed at gathering international support for Iraq's new government.
The conference will also include Iraqi leaders, officials from more than 80 nations and United Nations Secretary-General Kofi Annan.
On Monday, Ms. Rice visited Saudi Arabia for the last stop of a Middle East trip, where she renewed a call for democratic reform.