Someone broke into the southwest Las Vegas office of Sen. Dean Heller, R-Nev., on Sunday morning.

The Las Vegas Metro Police Department confirmed Monday an unnamed person trespassed into the senator's office lobby around 9 a.m. local time Sunday.

The person who broke into the building at 8930 W. Sunset Road may also have left a threatening note for Heller, according to a statement from police.

Police are investigating the incident and a spokesperson for Heller's office would not offer additional information or confirm that a note was left.

"The preliminary investigation by patrol officers determined that a burglary did not occur to the main building or to Senator Heller's office. However, a threatening note addressed to Senator Heller was discovered near the door to his office. Officers took a report for Threatening or Obscene Letters or Writing," the police statement said.

It's unknown whether the suspect stole anything from the office.

Police said they are not disclosing the content of the threatening note at this time.