TThe Federal Communications Commission (FCC) is investigating a day after outages affected 911 calling service in at least four states.
The outages affected citizens’ ability to call 911 statewide in South Dakota, as well as parts of Nevada, Texas and Nebraska, for hours into Wednesday night, in some cases leaving people without the ability to immediately connect to 911.
“We are aware of reports of 911-related outages and are currently investigating,” the FCC said posted on X, old Twitter, on Thursday.
In Texas, the Del Rio Police Department attributed the outage to an unidentified cell phone service provider, writing in a post on Facebook: “We are aware of an outage with a major cellular carrier that is impacting the ability to reach 911. This is an issue with the carrier and not the City of Del Rio’s systems. Our emergency services remain operational.”
Communications Supervisor Juan Hernandez told TIME on Thursday that the problem was not with the department’s 911 operator or service, but with certain people in the community whose cell phones were unable to call 911. When asked which service provider cell phone had problems, he said: “I believe it was T-Mobile.”
However, Chase County in Nebraska reported on Wednesday that “911 was down again throughout the state of Nebraska for all cell phone carriers except T-Mobile. Landlines can still reach 911. The county said services were back up and running 12 hours later.
TIME has reached out to T-Mobile and the FCC for comment.
Elsewhere in Nebraska, Dundy County has flagged issues around the same time, saying that “the 911 service provider in the state of Nebraska was working diligently to restore service.” Sarpy County 911 reported that “some cell phone carriers are unable to contact 911” and said the issue was resolved about three and a half hours later.
In South Dakota, 911 service was disrupted statewide, although text messages to 911 were still operating in most locations, the state Department of Public Security said. Fast city police reported 911 services dropped and advised residents of their city or county to call other numbers. Dispatchers could still see the phone numbers of people trying to call 911, and each attempt received a callback from a dispatcher. Service was restored about two hours later.
Las Vegas Metropolitan Police Department reported a 911 outage By 7 p.m., text was still an option, but 911 calls from landlines and calls to its non-emergency line were impacted. Police instructed people to call 911 on a cell phone and dispatchers could still see the number and call back immediately. Service was restored around 9 p.m.
Also in Texas, the Kilgore Police Department reported its system was intermittently down “due to issues with 911 throughout the area” and urged residents to call another number in case of an emergency.
The Department of Homeland Security Warned of the possibility of cyberattacks on 911 infrastructure, but law enforcement authorities told NBC News that there is no indication that the recent outages were caused by a cyber attack.
This story originally appeared on Time.com read the full story
