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    UPDATE 1-Macau govt probes Sands over document transfer to U.S.

    * Sands announces investigation in voluntary notice

    * Latest legal action involving casino mogul Adelson

    * Case dates back to 2010 dismissal of CEO Jacobs

    (Adds lawyer comment, details)

    HONG KONG/LOS ANGELES, Aug 1 (Reuters) - The Macau

    government has launched an official investigation into Sands

    China, owned by billionaire Sheldon Adelson, after the

    company transferred documents linked to a wrongful dismissal

    case to the United States from Macau.

    It is the latest twist in a saga that has become a firestorm

    for the casino mogul, who owns casinos in Las Vegas, Macau and

    Singapore and is the most active donor in U.S. Republican

    candidate Mitt Romney's presidential campaign.

    Adelson's lawyers are due to face an Aug. 30 hearing in the

    United States, where District Court Judge Elizabeth Gonzales

    will decide whether Las Vegas Sands Corp withheld

    financial documents in a case in which the 78-year-old is

    accused of having personally approved of prostitution at the

    company's casino in China's special administrative region of

    Macau.

    Sands, the biggest casino operator in Macau by market value,

    announced the Macau investigation on Wednesday in a voluntary

    notice. It did not provide further comment on the probe.

    The closely watched case began in October 2010 as a wrongful

    termination suit filed by Steven Jacobs, who was fired in July

    2010 from his job as chief executive officer of Sands China Ltd

    , Sands' Macau subsidiary.

    Jacobs claims in court documents that he was wrongfully

    dismissed after clashing with Adelson over what Jacobs alleged

    was improper and illegal conduct, including allowing

    prostitution and hiding the use of unauthorized construction

    workers for the Sands China casino.

    His suit triggered a federal investigation by the U.S.

    Securities and Exchange Commission into its Macau operations.

    Sands lawyers acknowledged to Judge Gonzales in June that

    they were in possession of documents from Jacobs' computer hard

    drive, after having previously said that the information could

    not be produced without violating Macau data protection laws.

    Last week, the nonprofit investigative-journalism

    organization ProPublica reported that Sands had transferred

    these documents to the United States from Macau, citing a court

    filing and a deposition of Sands Assistant General Counsel

    Michael Kostrinsky.

    Sands lawyers now say, according to a filing, that the

    documents were transported "in error" on a hard disk to the

    casino's deputy general counsel in the U.S. in November 2010

    without notifying Macau authorities.

    The charges cast a harsh light on Adelson, the largest

    individual donor to U.S. Republican candidates in 2012

    campaigns. Adelson and his wife recently gave $10 million to the

    Restore Our Future, a super PAC to support Romney's presidential

    bid.

    The company denies all the charges made by Jacobs. "These

    questions will be answered in due course in the most appropriate

    forum -- namely the courtroom," said Sands spokesman Ron Reese.

    In March 2011, Las Vegas Sands also said it was being

    investigated by U.S. authorities for potential breaches of the

    Foreign Corrupt Practices Act (FCPA), which prohibits bribes to

    foreign officials by U.S. companies.

    Shares in Sands China fell 3 percent after the market opened

    in Hong Kong on Wednesday but erased gains to trade down 1

    percent ahead by midday.

    GROWTH SLOWING

    The latest skirmish between Jacobs and Adelson and the Macau

    government investigation comes at a time when growth is sharply

    slowing in the world's largest gambling destination, dealing a

    further blow to Adelson's casino behemoth.

    Las Vegas Sands' second quarter earnings released last week

    missed forecasts, hit by lower profits at its Asian properties

    that had previously been resilient in offsetting broader

    economic malaise.

    Macau on Wednesday said gambling revenues inched up 1.5

    percent in July from a year earlier, the slowest growth since

    the financial crisis in 2009 as a tropical storm reduced visitor

    numbers, compounding subdued demand from Chinese gamblers.

    The August hearing in the U.S. could have significant

    ramifications for Sands and Adelson, ranging from a fine to a

    favorable ruling for Jacobs on certain issues. The former

    employee is seeking millions of dollars in salary, bonuses and

    stock options.

    "In general, a sanctions hearing can be a big deal in this

    context," said Eli Richardson, a lawyer with Bass, Berry & Sims,

    who specializes in the Foreign Corrupt Practices Act. "The court

    could decide to rule in the plaintiff's favor just because the

    defendant did not produce what it should have produced."

    Jacobs has also alleged he was fired because he objected to

    illegal demands made by Adelson, such as one involving the

    hiring of Macau lawyer, Leonel Alves, a Macau public official.

    Hiring Alves, who was listed as Sands China's counsel for

    more than a year, could have put the company in violation of the

    FCPA, Jacobs claimed. Paying a public official in any capacity

    raises questions of bribery by U.S. companies abroad.

    Adelson is also embroiled in other court battles, including

    one in Macau where he is being sued by Asian American

    Entertainment, a former business partner who is a Taiwanese

    businessman known as Marshall Hao.

    (Reporting by Farah Master in Hong Kong and Sue Zeidler in Los

    Angeles; Editing by Ronald Grover, Chris Gallagher and Jeremy

    Laurence)