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.

Two hours later, Verizon posted an update on social media, saying that its engineers were “continuing to address today’s service interruptions,” but did not say if a specific reason for the outage had been identified or when it could be resolved.

“We understand the impact this has on your day and remain committed to resolving this as quickly as possible,” the company said.

Despite those efforts, shortly after 4:00 p.m. ET, Verizon issued a third statement that contained little new information. The company said teams were “on the ground actively working to fix today’s service issue.”

Users had initially reported problems with Verizon’s competitors, T-Mobile and AT&T, as well. But both companies said they were not experiencing any service problems.

“T-Mobile’s network is keeping our customers connected, and we’ve confirmed that our network is operating normally and as expected,” 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.”

A spokeswoman for AT&T also said the company’s network was “operating normally.”

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.”