"I'm in California today to support Bristol," Sarah Palin wrote on her Facebook page.
"I'm sorry to see that she's again getting those annoying death threats and more 'mysterious white powder' sent to her while on DWTS this All-Star season," she said. "These threats sure waste a lot of time, production and public resources: but do the haters really think this will stop Bristol and Mark and the show's producers from keepin' on keepin' on? Silly critics--after all these years of goofy antics like this we find these efforts are actually quite motivating! Bristol's not letting this get her down."
TMZ reported last week a suspicious package sent to 21-year-old Bristol at the Los Angeles studio where "Dancing with the Stars" is taped turned out to be harmless.
Bristol is a single mother, author and reality TV personality. She is competing on the all-stars edition of the ballroom dance show. Her mother was the Republican vice presidential candidate in 2008.
Police, fire and health officials were dispatched to the studio this week to investigate a package with powder on it, but the substance proved innocuous.
A similar incident occurred in 2010 when Bristol previously appeared on the series. The package at the focus of that incident was also declared harmless.
Palin's publicist declined to comment on the most recent matter to E! News, citing the show's policy to not discuss security issues publicly.