The search was conducted by federal authorities, CNN and other outlets report.
"This operation is part of an ongoing federal criminal investigation," a spokesperson for the US Department of Justice said, according to CNN.
It is still unclear what type of crime is being investigated, but representatives of the Trump administration have previously indicated that Omar, who is running for re-election in the upcoming midterm elections, is under investigation.
In September, President Donald Trump's border chief, Tom Homan, said that "things are going on" regarding Omar, without providing any further details.
On Monday, Homan confirmed that a search had taken place.
"As for details, I can refer you to Todd Blanche (Attorney General) or Markwayne Mullin (Secretary of Homeland Security)," he told Fox News.
Ilhan Omar has been verbally attacked by Trump several times, most recently in his remarks about Somalis in her home state of Minnesota in December last year. She was elected to the House of Representatives in 2018 after arriving in the United States as a teenager, a refugee from Somalia.
Omar has not commented on the incident.
