Verizon said on Wednesday that its wireless service was suffering an outage impacting cellular data and voice services.

The nation’s largest wireless carrier said that its “engineers are engaged and are working to identify and solve the issue quickly.”

Verizon’s statement came after a swath of social media comments directed at Verizon, with users saying that their mobile devices were showing no bars of service or “SOS,” indicating a lack of connection.

Verizon, which has more than 146 million customers, appears to have started experiencing services issues around 12:00 p.m. ET, according to comments on social media site X.

Users also reported problems with Verizon competitor T-Mobile. But the company said that it was not having any service issues.

“T-Mobile’s network is keeping our customers connected, and we’ve confirmed that our network is operating optimally,” a spokesperson told NBC News. “However, due to Verizon’s reported outage, our customers may not be able to reach someone with Verizon service at this time.”

AT&T also said it was not experiencing any technical issues. “Our network is operating normally at this time,” said a spokeswoman for the provider.

In Washington, D.C., the District’s official emergency notification system sent out a message to residents saying that the Verizon outage was “nationwide.”

“If you have an emergency and can not connect using your Verizon Wireless device, please connect using a device from another carrier, a landline, or go to a police district or fire station to report the emergency,” the AlertDC system told recipients.

New York City’s Office of Emergency Management also said it was aware of the outage without mentioning Verizon by name. The city said it was “working closely with our partners” to review the outage and “assess any potential effects on city agencies & essential services.”