Customers of AT&T reported outages in several major US cities late Tuesday (Jun. 4).

According to a statement sent to multiple media outlets, the company said the problem prevented many customers from completing calls between carriers. Competitor services could also not place calls to an AT&T customer.

CNN quoted the telco firm as saying that, despite the glitch, calls between AT&T customers and 911 calls made using AT&T are still going through, but some customers reported that their service was disrupted completely.

The outage does not impact Internet access; AT&T added it.

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Scope of AT&T, Verizon Outage

According to Down Detector, the spike in reports began around 13:00 ET (17:00 UTC) and increased until they began to decline by 18:00 ET (22:00 UTC).

The site detected reports in several cities, including New York City, Chicago, Philadelphia, Dallas, Pittsburgh, and Indianapolis.

The outage came less than four months after a massive disruption that disabled service for the AT&T network for nearly 12 hours.

In a separate incident last March, the company said that it had been hacked. The stolen data contained sensitive information, such as account holders' Social Security numbers.

On the other hand, Down Detector also recorded that Verizon customers experienced outages on Tuesday.

Meanwhile, USA Today reported that the Federal Communications Commission (FCC) was aware of the outages and would investigate the matter.

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