US President George W. Bush on Saturday bemoaned the latest assassination of a Lebanese official and told Syria and Iran to stop meddling in its neighbor's affairs. Investigators tried to determine if the killing was tied to attacks against anti-Syrian politicians. Iran, which supports the Syrian-based opposition in a power struggle with Beirut's Western-allied government, came under criticism along with Syria for working to undermine Lebanese institutions. "We demand that Syria, Iran and their allies end their interference in and obstruction of Lebanon's political process," the president said in a statement. Syria has been blamed for the car bomb Friday that killed Capt. Wissam Eid, whose work included investigating the 2005 assassination of former Prime Minister Rafik Hariri. Damascus has denied any role.