CHICAGO (CBS) — An apparent computer failure has led to disruption of 911 service in four Illinois counties.

Telecom company Frontier had a 911 service failure at about 7 p.m. Tuesday, affecting Ogle, DeKalb, Lee and Stephenson counties, according to the Ogle County Sheriff’s Department.

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Initially people were being told to dial police numbers directly, in the event of an emergency; but officials have managed to re-route 911 calls so they’re getting through to the counties’ respective sheriff’s departments.

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The DeKalb Police Department, on its Facebook page, said it’s likely service will be down all day and into the night.

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Frontier, according to police, is working on solving the problem.