Officials in some U.S. states, including Alaska, Virginia and Iowa, warned of 911 problems in their areas.

Alaska State Troopers warned that many 911 and non-emergency call centers across the state were not working correctly and shared alternate numbers for areas where 911 wasn’t working.

In Virginia, the City of Fairfax Police Department said on social media that it was experiencing technical difficulties with its phone systems, including 911. The department shared a non-emergency number for callers and said 911 could still be used, but calls would not go directly to the dispatch center.

The New Hampshire Emergency Services and Communications reported a temporary interruption early Friday. Around 1 am., New Hampshire 911 telecommunicators reported not being able to answer incoming 911 calls that they could see on their computer systems, the agency said in a news release. Calls that couldn’t be answered were returned to make sure people got the help they needed. By 3:30 a.m., calls and texts to 911 were being received on a backup system and the system has been fully restored, officials said.

In Iowa, the Marion County Sheriff’s Office warned on social media that phone lines were down. The department said that 911 calls might be routed to neighboring counties, but emergency calls would be promptly redirected to the sheriff’s office.