Updated from 6:03 a.m. ET on Thursday, June 15
 
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Here are five things you must know for Thursday, June 15:
 
1. -- U.S. stock futures traded lower on Thursday, June 15, and European shares fell sharply after the Federal Reserve raised U.S. interest rates and a report said special counsel Robert Mueller has begun interviewing top government officials as part of an investigation into whether Donald Trump tried to obstruct justice regarding Russia's role in the 2016 election.
 
"Trump had received private assurances from then-FBI Director James B. Comey starting in January that he was not personally under investigation," said a story in The Washington Post. "Officials say that changed shortly after Comey's firing."

Basing its information on several unnamed sources, the newspaper said Mueller's obstruction-of-justice investigation of Trump began within days of Comey's dismissal on May 9. "Preliminary interviews scheduled with intelligence officials indicate his team is actively pursuing potential witnesses inside and outside the government," the Post reported.

Stocks in the U.S. on Wednesday, June 14, finished mixed after the Federal Open Market Committee, the monetary policy arm of the Federal Reserve, raised interest rates by 25 basis points, putting the Fed's target rate at 1% to 1.25%. The expected increase was the Fed's second of the year and was taken as a vote of confidence in the U.S. economic recovery and future pace of growth.

Most officials at the Fed telegraphed one more rate hike this year and an average of three in 2018. 

2. -- The economic calendar in the U.S. on Thursday includes weekly Jobless Claims at 8:30 a.m. ET, the Philadelphia Fed Business Outlook Survey for June at 8:30 a.m., the Empire State Manufacturing Survey for June at 8:30 a.m., Import and Export Prices for May at 8:30 a.m., Industrial Production for May at 9:15 a.m., and the Housing Market Index for June at 10 a.m.

Earnings are expected Thursday from Kroger Co. ( KR) , Bob Evans Farms Inc. ( BOBE) and Finisar Corp. ( FNSR) .
 
3. -- Slack Technologies Inc. has received recent inquiries about a potential takeover from technology companies including Amazon.com Inc.  ( AMZN) , people with knowledge of the situation told Bloomberg.
 
A deal could value the messaging startup at more than $9 billion, the report said. 

Slack is a platform on which employees can send messages, collaborate, organize and share files, with technology that also integrates with a wide variety of business software -- such as that from Salesforce.com Inc. and Microsoft Corp.'s Skype -- allowing employees to do all their work within Slack.

Slack raised $200 million in its latest funding round in 2016, valuing it at $3.8 billion, and has 5 million daily active users -- 1.5 million of whom pay to use the service -- and had $150 million in annual recurring revenue as of Jan. 31.

An agreement isn't certain and discussions may not go further, the sources told Bloomberg. A representative for Amazon.com declined to comment for Bloomberg, as did Slack.

4. -- Western Digital Corp. (WDC) has sought a court injunction in California to prevent Toshiba Corp. (TOSYY)  from selling its chip business, a move that could throw doubt over the much-needed sale that could be worth more than $20 billion. 

Western Digital said several of its SanDisk subsidiaries were seeking preliminary injunctive relief in the Superior Court of California for the County of San Francisco to prevent Toshiba from transferring its three NAND flash-memory joint ventures operated with Western Digital until the result of the arbitration is known.

The move puts into doubt Western Digital's place in the bidding process for the unit, which could fetch Toshiba up to $20 billion. Other bidders include Foxconn, which has assembled a consortium that includes Apple Inc. , computing giant Dell Inc. and Kingston Technology Co.
 
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5. -- Tesla ( TSLA) CEO Elon Musk tweeted Wednesday that he was currently in discussions with the Indian government regarding Tesla's operations in the country.

In discussions with the government of India requesting temporary relief on import penalties/restrictions until a local factory is built

- Elon Musk (@elonmusk) June 14, 2017

Last month, Musk took to Twitter to announce that his plans for India had been delayed by the country's "Make in India" push which requires foreign companies to source at least 30% of their products locally.

For Tesla vehicles, "the supply doesn't yet exist in India to support that," Musk said.

Separately, the standard 90-day corporate equity lockup period for Tesla, following its $402.5 million stock sale in March, ends Thursday, June 15. As a result, Tesla will be free to conduct another stock offering as soon as Thursday, which is a real possibility given the electric car company's debt situation, partly due to its Solar City investment, and need for additional cash.

Any new issuance the company may seek would likely need to take place before July, which is when Tesla issues its quarterly report on car sales. Alternatively, an offering could come in late August after Tesla issues its quarterly financial report.

Tesla fell 1.9% in premarket trading on Thursday.

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