A nationwide Verizon outage left cellphone users, including more than 10,000 customers in New York City, without service on Wednesday.

The mass disruption began around noon and prompted an emergency alert from New York City’s Office of Emergency Management.

More than 155,000 outages were reported across the country in the last 24 hours, with an estimated 10,232 in New York City alone, according to the tracking site Downdetector.

City officials issued an alert early Wednesday afternoon, warning residents about the potential for service issues. While the city did not name Verizon directly, the agency acknowledged it was working with network providers and utility companies to determine the cause and assess any effects on essential services.

“We are also gathering information and updates from the affected network providers,” NYC Emergency Management said on social media. “The cause and scope of the outage are still being investigated. We will provide updates if the situation changes in a way that impacts the City of New York.”

Verizon has not said when service will be fully restored.

The company posted an initial statement on X, formerly Twitter, shortly after 1 p.m.

“We are aware of an issue impacting wireless voice and data services for some customers,” the company wrote. “Our engineers are engaged and are working to identify and solve the issue quickly. We understand how important reliable connectivity is and apologize for the inconvenience.”

About an hour later, the company shared another update, saying its engineering teams were “fully deployed” and continuing to address the service interruptions.

New Yorkers using other carriers also reported outages. About 275 T-Mobile users and 226 AT&T customers in the city reported problems on Wednesday, according to Downdetector.

Notify NYC, the city’s official emergency alert system, posted an advisory noting that the Verizon outage may affect some customers’ ability to call 911.

Officials urged residents to use a device from another carrier, a landline or to report emergencies in person at a police precinct or fire station.

Verizon, which has more than 146 million users nationwide, opened a new headquarters in Midtown last summer.

This is a developing story and may be updated.