Detailed Instructions: In this task, you are given a text of many news articles seperated by special token "|||||". Your task is to summarize them.
Q: The Verizon logo is seen on the side of a truck in New York City, U.S., October 13, 2016. REUTERS/Brendan McDermid 
  
 WASHINGTON Verizon Communications Inc (VZ.N) said on Thursday it has a "reasonable basis" to believe Yahoo Inc's (YHOO.O) massive data breach of email accounts represents a material impact that could allow Verizon to withdraw from its $4.83 billion deal to buy the technology company. 
  
 Verizon's general counsel Craig Silliman told reporters at a roundtable in Washington the data breach could trigger a clause in the deal that would allow the U.S. wireless company not to complete it. 
  
 "I think we have a reasonable basis to believe right now that the impact is material and we're looking to Yahoo to demonstrate to us the full impact. If they believe that it's not then they'll need to show us that," he said, declining to comment on whether talks are under way to renegotiate the purchase price. 
  
 Asked for comment, a Yahoo spokesman said: "We are confident in Yahoo’s value and we continue to work towards integration with Verizon." 
  
 The deal has a clause that says Verizon can withdraw if a new event "reasonably can be expected to have a material adverse effect on the business, assets, properties, results of operation or financial condition of the business.” 
  
 Silliman said the U.S. Federal Trade Commission has approved Verizon's planned acquisition of Yahoo, but it still needs approval from the European Commission and the U.S. Securities and Exchange Commission is reviewing the proxy. 
  
 Verizon has had preliminary briefings from Yahoo but it still needs "significant information" from the company before it makes a final decision on the materiality of the hacking of at least 500 million email accounts, Silliman said. 
  
 He said Verizon is "absolutely evaluating (the breach) and will make determinations about whether and how to move forward with the deal based on our evaluation of the materiality." 
  
 Yahoo shares ended 1.75 percent lower at $41.62, while Verizon was largely unchanged, closing at $50.29, down 0.02 percent. 
  
 Yahoo in September disclosed that it had fallen victim to a data breach in 2014 that compromised users’ names, email addresses, telephone numbers, dates of birth and encrypted passwords. 
  
 The company has said the cyber attack was carried out by a “state-sponsored” actor, but some private security experts have challenged that assertion. 
  
 Several Democratic senators have pressed Yahoo to reveal more information about the hack and why it took so long to discover. 
  
 The internet firm said it learned of the breach this summer while investigating claims of a separate intrusion, but it has not provided a specific timeline of events. 
  
 Some analysts suggested Verizon may be trying to get a better price. 
  
 Roger Entner, an analyst at Recon Analytics, said "Verizon is rightfully upset about Yahoo not properly disclosing the breach." 
  
 He said Yahoo would most likely have to consider renegotiating the price with Verizon, if it came to that. 
  
 "I don't think it has much of a choice. Who else would want to buy them?" Entner said. 
  
 Experts said bidders who try to extract themselves from mergers using the material adverse clause face an uphill battle. No U.S. company has ever invoked the clause successfully in court to get out of a deal. 
  
 In 2013, Cooper Tire & Rubber company got cold feet about a $2.5 billion sale to Apollo Tyres and argued in the Delaware Court of Chancery that Apollo had seen a material adverse change related to union issues at a subsidiary of the company. The court rejected Cooper Tire’s claims and the deal fell apart. 
  
 A Delaware court ruled in 2001 that poultry producer Tyson Foods Inc (TSN.N) could not terminate its merger with beef producer IBP Inc over accounting irregularities. The court said the shortfall was not due to a long-term problem. 
  
 (Reporting by David Shepardson, additional reporting by Dustin Volz in Washington, Malathi Nayak in New York and Liana Baker in San Francisco; editing by Leslie Adler, Andrew Hay and Bernard Orr) ||||| Verizon just offered the clearest signal yet that it may reassess its deal to buy Yahoo. 
  
 Craig Silliman, Verizon's general counsel, told reporters on Thursday that the company has "a reasonable basis" to suspect that Yahoo's (YHOO, Tech30) massive security breach could have a meaningful financial impact on the deal, according to multiple reports. 
  
 "We're looking to Yahoo to demonstrate to us the full impact if they believe it's not. They'll need to show us that, but the process is in the works," Silliman said, according to The Washington Post. 
  
 Robert Varettoni, a spokesman for Verizon (VZ, Tech30), confirmed the statements, but declined to comment beyond it. 
  
 The comments suggest Verizon could look to renegotiate the deal price or back out of the $4.8 billion deal altogether. Yahoo's stock dipped after Silliman's remarks and was down nearly 2% in late trading Thursday. 
  
 Yahoo confirmed last month that data "associated with at least 500 million user accounts" had been stolen in one of the largest cybersecurity breaches ever. 
  
 Related: Verizon only just learned about Yahoo's massive data breach 
  
 Verizon, which agreed to buy Yahoo's core properties for $4.83 billion in July, said it had only learned of the breach two days before Yahoo disclosed it to the public. 
  
 At a conference earlier this week, Verizon CEO Lowell McAdam denied rumors that Verizon could demand a significantly lower price tag for buying Yahoo as a result of the breach. 
  
 "That is just total speculation. We still see a real value to the asset there," McAdam said, according to CNBC. "But in fairness, we're still understanding what was going on, to define whether it's a material impact to the business or not." 
  
 When the breach was first reported, some analysts told CNNMoney that it could shave off as much as $200 million from the deal price. 
  
 "It comes down to whether or not there is a meaningful change in use of the platform above and beyond what was happening before," Brian Wieser, an analyst who covers Yahoo at Pivotal Research Group, said at the time. 
  
 The Yahoo acquisition was originally expected to close in the first quarter of 2017. |||||
A:
It seems Verizon might be reconsidering its agreement to pay $4.8 billion to acquire Yahoo after the latter revealed last month that 500 million of its email accounts had been hacked, Reuters reports. Verizon had signed a deal to buy Yahoo in July, but a clause in the agreement says Verizon can back out if something happens that "reasonably can be expected to have a material adverse effect on the business ... or financial condition of the business." According to CNN, Verizon may now be looking to take advantage of that clause to either renegotiate the deal or get out of it altogether. After a Verizon lawyer said Thursday that the email hack likely fulfills that clause, Yahoo stock dipped nearly 2%. Analysts believe what amounts to one of the biggest data breaches in history could shave up to $200 million off Yahoo's value.