A post on site Sunday alerted visitors of the situation, KNBC-TV, Los Angeles, reported.
"Due to the lapse in federal funding, this Office of Justice Programs website is unavailable," the message read.
The site usually displays alerts about missing children and helps citizens connect with law enforcement officials.
California Highway Patrol officials said until the government is up and running, if an Amber Alert is issued, in California, authorities will page the media.
Wisconsin business offering 'therapeutic cuddling' forced to close
'SNL': 'Anchorman 2' cast, One Direction sing 'Afternoon Delight' [VIDEO]