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PHILADELPHIA (CBS) — Verizon has fixed the 911 outage affecting landline phones in West and Northwest Philadelphia.

People who live in those neighborhoods reported having trouble dialing 911 from landlines Monday.

“Verizon will remain making repairs to underground wiring, which is believed to have been the cause of the system interruption,” officials from the city’s Office of Emergency Management confirmed Tuesday.

Residents can resume using their landline phones to dial 911 after being without the ability to do so for nearly 16 hours.

An underground fire is believed to be the source of the issue.