Police Called to Britney's Home for 'Custodial Dispute'

FRIDAY JANUARY 04, 2008 02:30 AM EST UPDATED

Police were summoned to Britney Spears's Beverly Hills home Thursday evening in what LAPD are calling a "custodial dispute."

"Around 8 p.m. we got a call about a custodial dispute regarding Britney Spears's children," officer Jason Lee tells PEOPLE. "Officers are still there. We're trying to resolve the dispute peacefully per a court order."

Officer Lee could not give further details, but said "a few" police were dispatched, but no guns were being drawn. In addition to officers, fire trucks, two ambulance and a police helicopter were all on the scene. At one point, a gurney was seen being rolled up to the house from one of the ambulances.

Spears, who has visitation rights with her two sons Preston, 2, and Jayden James, 1, was scheduled to give the boys over to her ex-husband, Kevin Federline, at 7 p.m. Thursday. A bodyguard for Federline arrived to pick up the boys at the designated time, but Spears refused to relinquish her sons, according to a source.

Police, and Federline's lawyer, Mark Vincent Kaplan, arrived at the house close to 8 p.m., though Kaplan was later seen leaving.

Earlier in the day, Spears showed up 90 minutes late to a scheduled deposition in her custody case – and stayed for only a fraction of an hour.

Back at her Beverly Hills home directly after the hearing, when a photographer asked if Kaplan was nice to her, Spears, 26, responded with an emphatic, "No!"

When reached by PEOPLE Spears's lawyer, Sorrell Trope, who on Wednesday filed a request to withdraw from the singer's custody case, said only: "No comment."