The Los Angeles Police Department earlier this year investigated possible threats against Britney Spears' ex-husband Kevin Federline.
On Monday, LAPD spokeswoman Norma Eisenman said the department probed allegations in June, but later determined there was not enough information to keep the investigation active.
The FBI's Los Angeles field office received "nonspecific, uncorroborated allegations regarding a threat against Mr. Federline," according to FBI spokeswoman Laura Eimiller. She said the bureau passed the information to the LAPD because it was not a federal matter.
Eimiller declined to say whether the FBI received the information and would not describe the threat.
Kevin Federline was married to Britney Spears from 2004 to 2006. He is currently seeking primary custody of their sons, two-year-old Sean Preston and one-year-old Jayden James.