Another nationwide outage kept AT&T customers from calling 911 Tuesday morning.

Christian County Emergency Management says the outage lasted from around 5:30 a.m. to 7:30 a.m.

Christian County Emergency Services Executive Director Becky Bacon says the outage only affected cell phone users.

But it’s the third time it’s happened in less than a week.

Last week, a major outage affected both AT&T and U.S. Cellular users.

No word yet on what caused the outage.