AMMAN, Jordan—The oil ministers of Iraq, Iran and Syria Monday signed a preliminary agreement for a $10 billion natural-gas-pipeline deal, the official Iranian News Agency IRNA and other Iranian media reported.

The document was inked in the Assalouyeh industrial region located in the southern province of Bushehr by Iranian oil minister Mohammad Aliabadi, Iraq's oil minister Abdul Kareem Luaiby, and Syrian counterpart Sufian Alow, the agency said.

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