AMMAN (Reuters) - Syrian rebel negotiator Mohammad Alloush said on Monday he would head the rebel delegation to the peace talks backed by Russia and Turkey in Kazakhastan, saying this was to "neutralize the criminal role " of Iran in the Syrian conflict.

Alloush, a former senior negotiator with the Saudi-backed Higher Negotiations Committee during past rounds of U.N.- sponsored peace talks in Geneva, said their participation was needed to hold back Iran's militias fighting in Syria.

(Reporting by Suleiman Al-Khalidi)