WRAPUP 5-China exec probed for leaking price strategy to Rio

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* Rio Tinto detainees suspected of bribery - Chinese paper

* Shougang executive leaked "bottom line" to Rio - source

* Rio "surprised", says unaware of evidence for allegations

* Australia PM Rudd pressured to lever China

* Case plunges steel industry into an "ice box" - analyst

By Rob Taylor and Lucy Hornby

CANBERRA/BEIJING, July 10 (Reuters) - A Chinese steel executive detained along with four Rio Tinto employees is being investigated for leaking China's "bottom line" on iron ore prices, a source with knowledge of the probe said on Friday.

Tan Yixin, the head of iron ore imports for state-owned steelmaker Shougang, is suspected of "revealing China's negotiating strategy" to Anglo-Australian miner Rio Tinto Ltd (RIO.AX) (RIO.L), the source told Reuters, requesting anonymity.

The case has stunned the global steel industry, which was already transfixed on the marathon iron ore talks. After more than six months of cat-and-mouse, China appeared to be boxed in, forced to accept Rio's price or to abandon long-term deals and risk destroying a decades-old pricing system.

The shock detentions appear to have left the price talks in limbo and cast a shadow on relations between Beijing and Canberra, whose economies have been welded together in recent years by China's huge demand for metals and minerals.

As Australia sought to avert the diplomatic row, the China Securities Journal said Shanghai's State Security Bureau accused the three local Rio staff and senior Australian executive Stern Hu of bribing unidentified Chinese steelmakers during tense iron ore price negotiations this year.

"This seriously damaged China's economic security and interests," said the paper, published by the state-run Xinhua news agency. "The activities of Stern Hu and the others violated Chinese law as well as international business morality."

Asked if negotiating strategy meant iron ore prices, the Reuters source said: "Yes, China's bottom line."

China dominates the steel industry, making as much as the next eight biggest steel-producing countries put together, and its iron ore imports, which play a major role in setting global shipping prices, have hit unprecedented levels this year.

The episode has put the industry, which relies on open market information for trading and pricing, in an "ice box," said one Chinese iron ore analyst. Several state-owned steel company executives from Beijing expected a wave of change to sweep through the sector after the investigation, which they said was much wider ranging than the five detentions so far.