OAKLAND — An alternative phone line for police emergencies in Oakland is working again following an hours-long outage Monday, police said.

The 510-777-3211 cell and land line for 911 calls to Oakland Police Department dispatchers went down just before 1 p.m., as did the non-emergency 510-777-3333 line.

Just before 7 p.m., police announced via Twitter the lines were “operational.”

Update: Oakland Police alternate numbers for police services (510) 777-3211 and (510) 777-3333 are operational. pic.twitter.com/adSkPIvm8E — Oakland Police Dept. (@oaklandpoliceca) January 22, 2019

The problem did not appear to impact police services, and those calling 911 directly could still get through to dispatchers while the alternative line was down, according to police.

Police did not release a cause for the outage.

A police spokesperson could not be immediately reached for additional information Monday night.

Check back for updates.