Several states experienced outages in 911 calls Wednesday night, which emergency calling system service provider Lumen said were caused by a third-party utility pole installation.

A Lumen spokesperson said Thursday in a statement to ABC News: “Some customers in Nevada, South Dakota and Nebraska experienced an outage due to a third-party company installing a light pole, unrelated to our services.”

“We restored all services in about two and a half hours,” Lumen said. “Our technicians identified the issue and worked hard to fix it as quickly as possible. We apologize for the inconvenience and appreciate our customers’ patience and understanding.”

The Federal Communications Commission is investigating.

The outages affected areas of Nevada, Nebraska and Texas, as well as the entire state of South Dakota.

In Nevada, the Las Vegas Metropolitan Police Department said service had been restored in the city shortly before 9:15 p.m. PT on Wednesday.

“All callers during the outage were called back and provided assistance,” Las Vegas police said.

Nevada State Police also confirmed that service had been restored for Clark County in southern Nevada, which includes Las Vegas and Henderson.

According to police, the entire state emergency calling system in South Dakota suffered an outage.

The South Dakota Department of Public Safety said the outage lasted from approximately 8 p.m. to 11 p.m.

During the outage, “the State 9-1-1 Coordinator was in constant and extensive communication with the state’s 9-1-1 service provider, Lumen, and the state’s 28 9-1-1 dispatch centers.” the department said.

“Although some calls may not have been placed, the system allows dispatch centers to identify the phone number of callers and return those calls. The 9-1-1 system is fully operational and ready to respond quickly to any emerging situation,” the department said. saying.

“Last night’s outage was unprecedented in terms of duration and magnitude,” Sioux Falls Division Fire Chief Mike Gramlick said at a news conference Thursday. “Our team at Metro Communications, which serves as the public safety response point for the area, handled the situation with exceptional professionalism.”

Dundy County, Nebraska, and the surrounding area suffered outages, but 911 service for both mobile and landline telephones was later restored, according to authorities.

Several Texas cities also suffered outages, including Del Rio and Kilgore. Some Texas police departments have not yet announced whether mobile and landline services will come back online.

ABC News’ Darren Reynolds and Victoria Arancio contributed to this report.