WASHINGTON (Reuters) - The Obama administration on Wednesday filed to block AT&T's proposed acquisition of wireless rival T-Mobile USA because of anti-competitive concerns, two sources familiar with the matter said.
Blocking the combination on antitrust grounds would be a big blow to the telecommunication giant's expansion plans.
A Justice Department spokeswoman declined to comment as did a spokesman for AT&T. A Federal Communications Commission spokesperson said the commission has not made a decision to block the deal.
Shares in AT&T slid 3.5 percent to $28.66. Stock in rival Sprint Nextel Corp surged 9.9 percent to $3.90.
(Reporting by Jeremy Pelofsky. Editing by Robert MacMillan)
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