CAIRO Oct 16 (Reuters) - OPEC+ member states lined up on Sunday to endorse a steep production cut agreed this month after the White House, stepping up a war of words with Riyadh, claimed Saudi Arabia had pushed some other nations into the move. Iraq, OPEC's second largest exporter, said the decision was based on economic indicators and was taken unanimously. The cut came despite oil markets being tight, with inventories in major economies at lower levels than when OPEC has cut output in the past. But some analysts have said recent volatility in crude markets could be remedied by a cut that would help attract investors to a market that was underperforming fundamentals. Oman's energy ministry said OPEC+ decisions were based purely on the realities of market supply and demand.

---