WASHINGTON, July 12 (Reuters) - AT&T ( T ) said Friday

that data from about 109 million customer accounts containing

records of calls and texts from 2022 was illegally downloaded in

April.

The U.S. telecom company said the FBI is investigating and

at least one person has been arrested after AT&T ( T ) call logs were

copied from its workspace on a third-party cloud platform.

AT&T ( T ) said the compromised data includes files containing

AT&T ( T ) records of calls and texts of nearly all of AT&T's ( T ) cellular

and AT&T's ( T ) landline customers interacting with those cellular

numbers between May 2022 and October 2022 but does not contain

the content of calls or texts or personal information such as

social security numbers.

The FBI did not immediately comment.

The compromised data also includes records from

Jan. 2, 2023, for a very small number of customers.

AT&T ( T ) said it first learned on April 19 that a hacker had

claimed to have unlawfully accessed and copied AT&T ( T ) call logs.

The company said its investigation found hackers had between

April 14 and April 25 unlawfully exfiltrated files containing

AT&T ( T ) records of customer call and text interactions. The records

also include AT&T ( T ) customers of mobile virtual network operators

using AT&T's ( T ) wireless network.

These records identify telephone numbers with which a

wireless number interacted during these periods and aggregate

call duration. A subset of records includes one or more cell

site identification number.

AT&T ( T ) said it has taken additional cybersecurity measures

including closing off the point of unlawful access.

AT&T ( T ) is working with law enforcement and said had delayed

public notification after the Justice Department determined it

was warranted. AT&T ( T ) added it does not believe that the data is

publicly available.

The company added the incident has not had a material impact

on AT&T's ( T ) operations.