According to the various media reports, the ex-husband of the troubled pop star Britney Spears has called the police because he feared for his children’s lives.

On Friday morning, Britney Spears was taken by ambulance to the Cedars Sinai Medical Center following a three-hour standoff with police at her luxury Hollywood home. According to reports, she locked herself and her year-old son Jayden in a bedroom rather than turn them over to her ex-husband's bodyguard as she was supposed to.

During the weekend, the British media reported that Kevin Federline feared Britney would use the Beretta pistol he bought her as a birthday gift to kill their two young sons.

Quoting a friend of K Fed, The Sun reported K-Fed was terrified. “He realised she had a gun where she was holding them.” the friend allegedly said.

"Britney said that Kevin could have an incredible 100 million dollars if he'd give HER the kids and never see them again”, the source also revealed.

Because of the incident, Britney Spears has lost the visitation rights. The Los Angeles judge, who handles, the custody dispute between Spears and ex-husband Kevin Federline suspended the pop star's visitation rights at an emergency court hearing.

During the weekend, Britney Spears left the Cedars Sinai Medical Center through an underground tunnel to avoid paparazzi who have laid siege to the building, according to the US broadcast show "Entertainment Tonight."

Beforehand, the singer received a visit from celebrity television therapist Dr Phil McGraw, who said afterwards he believed Spears was in urgent need of medical and psychological treatment.

An LAPD rep said: “The police were called out to Britney Spears’ residence to investigate custody issues over her children - not because there was a gun in the house.”

Also, Los Angeles police have no plans to charge Spears with any crime relating to the incident. "We were only there because of the child-custody dispute, and that's going to play out in the courts," police spokesperson Ana Aguirre told MTV News.