(CNN) -- Ann Romney's plane made an emergency landing in Colorado on Friday, a spokeswoman from Mitt Romney's presidential campaign tweeted.
"All okay. Thank goodness," the spokeswoman, Andrea Saul, wrote on Twitter.
The cabin of the plane apparently filled with smoke, according to a campaign aide. Romney's plane was headed to California but landed in Denver, where it was met with emergency vehicles on the runway.
Ann Romney was near Omaha, Nebraska earlier Friday.
CNN Political Producer Rachel Streitfeld contributed to this report.