TEHRAN, Nov. 13 (MNA) — Lebanese Prime Minister Fouad Siniora urged Iran on Sunday to act as an intermediary between Lebanon and Syria, the Al-Manar television network quoted informed sources as saying. He made the call in a meeting with Masud Edrisi, the Iranian ambassador to Lebanon.  Siniora noted that the Middle East is in a very sensitive situation and that the utmost efforts should be made to expand cooperation with Syria. Meanwhile, Edrisi has said that in the meeting the Lebanese prime minister had stressed that brotherly relations between Lebanon, Syria and Iran should continue. Syrian President Bashar Assad, in a televised speech on Thursday, called Lebanon a base for plotting conspiracies against Syria, an accusation that Lebanon strongly rejected. Relations between Syria and Beirut have soured since the assassination of former Lebanese Prime Minister Rafiq Hariri in Beirut on February 14, 2005