Stocks extended losses on Monday morning as crude oil crumbled on demand concerns. 

The S&P 500 fell 0.44%, the Dow Jones Industrial Average slid 0.48%, and the Nasdaq was down 0.2%.

Crude fell to two-and-a-half-month lows on Monday after analysts at Barclays and Morgan Stanley remained bearish on commodities. Barclays said global oil demand in the current quarter was growing at less than one-third the rate of a year earlier. Morgan Stanley noted that headwinds such as U.S. oversupply and falling demand were growing in the second half of the year.

West Texas Intermediate crude oil was down 2% to $43.29 a barrel on Monday morning. 

Members of the Federal Open Market Committee will convene on Tuesday for a two-day meeting, followed by an announcement on Wednesday afternoon. Federal Reserve Chair Janet Yellen won't hold a press conference following the meeting.

Investors are fairly confident the Fed will not make a move in July, though the Fed statement will be analyzed with a fine-tooth comb for hints as to when the central bank might adjust its monetary policy. A rate hike in July currently has a 2.4% probability, according to CME Group Fed funds futures. A December rate hike is the most likely with a 40% chance.

"Despite favorable domestic data releases and the resolution of the U.K.-Leave vote, we do not expect a rate hike at the July meeting," UBS analysts wrote in a note. "The FOMC will most likely acknowledge the data updates as encouraging signs for the economy and note that they will continue to monitor global financial developments."

Verizon (VZ - Get Report) agreed to acquire Yahoo!'s  (YHOO) core Internet business for $4.8 billion after a months-long bidding process with multiple parties. Other potential candidates had included AT&T and private-equity firm TPG. Verizon's acquisition adds Yahoo!'s media companies including Yahoo Finance and Tumblr to Verizon's ad and media business, which includes last year's purchase of AOL. Yahoo! shares slipped 2.5% while Verizon shares fell slightly.

Tesla Motors (TSLA - Get Report) and SolarCity (SCTY) have made more steps toward agreeing upon a merger, according to Reuters. Elon Musk's companies are in the final stages of carrying out due diligence and could agree upon terms in coming days. Musk, which owns a significant stake in both, hopes to merge SolarCity panels with Tesla's current in-house auto battery packs, while also expanding into other vehicle models such as electric trucks and buses. Tesla announced the $2.8 billion offer last month.

Movie theater chain AMC Entertainment (AMC - Get Report) agreed to acquire Carmike Cinemas (CKEC) . The cash-and-stock deal is worth $1.2 billion and will likely result in annual cost synergies of roughly $35 million. Carmike shares slid 1%.

In earnings news, Sprint (S - Get Report) jumped 20% after its quarterly loss widened but sales topped estimates. The telecom giant, as expected by analysts, reported a per-share loss of 8 cents a share, wider than its loss of a penny a share in the year-ago quarter. Revenue of $8.01 billion came in higher than $7.99 billion consensus. Sprint reported postpaid net additions of 173,000 over its first quarter.

Kimberly-Clark (KMB - Get Report) fell 1.5% after topping second-quarter expectations but guiding for a softer-than-expected full year. The home goods company earned an adjusted $1.53 a share, 6 cents above estimates, while revenue of $4.59 billion exceeded estimates of $5.57 billion. Kimberly-Clark anticipates adjusted full-year earnings between $5.95 and $6.15 a share. Consensus was for $6.08.

Ericsson (ERIC - Get Report) added 2% after its board of directors agreed "the time is right" to find a new CEO. Shareholders had called for current CEO Hans Vestberg to be replaced. Chief Financial Officer Jan Frykhammar will hold the CEO position while an internal and external candidate search is undertaken.

Ameriprise (AMP - Get Report) was downgraded to sector perform from outperform with a $98 price target at RBC Capital. The firm said the company is facing increased regulatory challenges.

Hewlett-Packard Enterprise (HPE - Get Report) was upgraded to buy from neutral at Citigroup. Analysts said the move was a valuation call based on a $25 price target.

A Fort Myers, Fla., shooting at a club hosting an event for teenagers has left two people dead and at least 14 more injured early Monday. Two suspects have been detained for questioning. Police confirmed the nightclub shooting was "not an act of terror."