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Here are five things you must know for Tuesday, Sept. 5:

1. -- U.S. stock futures were lower on Tuesday, Sept. 5, as Wall Street returned from the Labor Day holiday, European shares tuned mixed and Asian shares finished the session mixed as nerves remained on edge following North Korea's latest nuclear test.

Global markets on Monday, Sept. 4, declined after North Korea successfully conducted its sixth nuclear test on Sunday, Sept. 3. Reports on Tuesday said North Korea could be preparing the possible launch of another intercontinental ballistic missile.

Global oil prices continued to react to developments in the Hurricane Harvey-ravaged Houston area, with U.S. crude heading higher but gas prices declining and retracing back to pre-storm levels as refiners and pipelines slowly return to full speed.

West Texas Intermediate crude oil rose 1.4% early Tuesday to $47.95 a barrel.

The economic calendar in the U.S. on Tuesday includes Factory Orders for July at 10 a.m. ET.

Federal Reserve Gov. Lael Brainard is scheduled to speak at the Economic Club of New York in New York at 7:30 a.m., while Minneapolis Fed President Neel Kashkari is scheduled to speak at the Carlson School of Management in Minneapolis at 1:10 p.m. 

2. -- United Technologies Corp.  (UTX) - Get Report  agreed to buy airplane parts maker Rockwell Collins Inc.  (COL) for $23 billion, or $140 a share, in the biggest deal in the history of aerospace.

Rockwell shareholders will receive $93.33 a share in cash and the remaining $46.67 in shares of United Technologies..

The deal is expected to close in the third quarter of 2018.

"This acquisition adds tremendous capabilities to our aerospace businesses and strengthens our complementary offerings of technologically advanced aerospace systems," said United Technologies Chairman and CEO Greg Hayes.

The deal comes after a report recently suggested that a large activist hedge fund manager, possibly Third Point LLC's Dan Loeb, has been accumulating a big United Technologies stake and has put the avionics and industrial company on the defensive in an effort to have it spin off non-core businesses.

United Technologies shares fell 3.8% to $113.50 in premarket trading on Tuesday, while Rockwell Collins rose 0.7% to $131.50.

3. -- Chicago-based Tronc Inc. (TRNC) , which owns the Chicago Tribune and Los Angeles Times among other newspapers, announced it was purchasing the New York Daily News. 

The Daily News, which has been owned by real estate developer Mort Zuckerman since 1993, was acquired by Tronc for just $1, plus the assumption of liabilities.

"The New York Daily News is a venerable New York City institution," Eric Gertler, co-publisher of the News, said in a statement. "We believe that under Tronc's leadership, the New York Daily News will maintain its tradition of excellence in journalism and continue to be a critical voice for millions of print and online readers."

Tronc CEO Justin Dearborn said acquiring the paper and its popular website would "provide us with another strategic platform for growing our digital business, expanding our reach and broadening our services for advertisers and marketers."

4. -- Rovio Entertainment Oy, the creator of Angry Birds, confirmed Tuesday that it is planning an initial public offering in Finland.

The Espoo, Finland-based company plans a share sale of about €30 million ($35.6 million) and a secondary sale by its largest shareholder, Trema International Holdings B.V., and certain other shareholders. The offering could value the games maker at about $2 billion, Bloomberg reported.

Shares are expected to be offered to private individuals and entities in Finland, Sweden and Denmark, along with institutional investors in Finland and internationally.

Rovio's operations are divided into games and brand licensing units with the games business unit accounting for 79% of Rovio's revenue for the 12 months ended in June 30.

5. -- Earnings reports are expected Tuesday from Hewlett Packard Enterprise Co. (HPE) - Get Report , Hudson's Bay Co. (HBAYF) and Dave & Buster's Entertainment Inc. (PLAY) - Get Report .

Updated from 6:01 a.m. ET

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