US telecoms giant AT&T and Deutsche Telekom have cast doubt over the $39bn (£25bn) sale of T-Mobile USA by withdrawing their merger application to the industry regulator.
AT&T also said it would include a $4bn charge in its fourth-quarter accounts to cover any potential compensation due if the deal does not go ahead.
The US Justice Department moved to block the sale at the end of August.
The two firms said they would focus on clearing the deal with the government.
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