Iraq's most revered Shia cleric Grand Ayatollah Ali al-Sistani has strongly objected to a 'security accord' between the US and Iraq.

The Grand Ayatollah has reiterated that he would not allow Iraq to sign such a deal with "the US occupiers" as long as he was alive, a source close to Ayatollah Sistani said.

The source added the Grand Ayatollah had voiced his strong objection to the deal during a meeting with Prime Minister Nouri al-Maliki in the holy city of Najaf on Thursday.