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* Offshore yuan rallies 1% from record lows, still weaker than 7
* PBOC to issue offshore bills, onshore fixing firmer than expected
* Trump administration says China is manipulating currency
* Shanghai shares fall 3.1% so far this week, down 1.6% on the day (Updates and adds charts, adds details, analyst comments)
HONG KONG/SHANGHAI, Aug 6 (Reuters) - China's tumbling yuan steadied on Tuesday as authorities took steps to contain its slide, while stocks tanked after Washington labeled Beijing a currency manipulator in a sharp escalation of Sino-U.S. trade tensions.
The currency has slumped as much as 2.7% over the past three days, breaking through the symbolic 7-per-dollar level, pounding stocks and pushing bonds higher as investors feared the yuan's value has become a new front in the trade war.
Early in Asian trading hours, U.S. Treasury Secretary Steven Mnuchin said Washington would designate China a currency manipulator, its first such move since 1994, sending both the onshore and offshore yuan to record lows..
China's commerce ministry also announced overnight that its companies had stopped buying U.S. agricultural products in retaliation against Washington's latest tariff threat.
But the People's Bank of China moved to stabilize the yuan with a firmer-than-expected fixing and a bond sale, to signal that the authorities wished to stem the rout, lifting the yuan nearly 0.5% on the dollar.
"I don't think they want to see a free float," said Khiem Do, head of Greater China investments at Barings. "This to advise the market not to short the yuan too much. That is a subtle message."
After the early low of 7.1382, following Mnuchin's announcement, the offshore yuan steadied around 7.0710 per dollar in afternoon trade.
The PBOC had fixed the yuan midpoint, which sets the point around which the currency is allowed to trade, at 6.9683 per dollar, above market expectations.
The PBOC's announcement of a sale of 30 billion yuan ($4.25 billion) worth of yuan-denominated bills in Hong Kong also suggested the central bank was soaking up cash to prevent speculative short-selling.
The currency opened onshore trade at 7.0699 per dollar, then firmed to 7.0318 by 0825 GMT. The offshore yuan rebounded more than 1% from its record low.
The stabilization was not enough to assuage markets although it did halt the slide in the stock market.
The Shanghai Composite Index fell 1.6% to its lowest close since February. Hong Kong's Hang Seng Index closed at its lowest since January, though its pared some losses during the day.
"Renminbi weakening pressure added uncertainty to the stock market and added pressure especially for financials and property companies," said Linus Yip, chief strategist at First Shanghai Securities in Hong Kong.
Chinese policy sources had told Reuters that the currency was allowed to fall so markets could factor in concerns over the tussle between the world's two largest economies, especially after U.S. President Donald Trump announced new tariffs last week.
Elsewhere, markets in Australia, Japan and throughout Southeast Asia also fell.
"We think the most important takeaway is the risk of U.S.-China trade war escalating further has increased," UBS Economist Tao Wang said in a note to clients.
"As the trade war escalates further and depreciation pressure on the renminbi intensifies, we expect the dollar/yuan to trade beyond 7 more often in the rest of the year."
(Reporting by Winni Zhou in SHANGHAI and Noah Sin in HONG KONG; Writing by Vidya Ranganathan Editing by Sam Holmes and Jacqueline Wong)