MILWAUKEE (REUTERS) - Singer Bobby Brown on Sunday asked for privacy regarding his and his late former wife Whitney Houston's daughter Bobbi Kristina Brown, who according to the police was found unresponsive in a bathtub at her Georgia home before she was revived at a hospital.

The incident comes nearly three years after Houston, a superstar who battled substance abuse, drowned in a bathtub in Beverly Hills, California, in February 2012. The authorities have said cocaine use and heart disease contributed to her death.

Brown, 21, was found on Saturday in the bathtub at her suburban Atlanta home by her husband Nick Gordon and a friend, the Roswell Police Department said. Gordon started CPR and police continued life-saving measures until an ambulance arrived and took her to the hospital.

"Privacy is requested in this matter. Please allow for my family to deal with this matter and give my daughter the love and support she needs at this time," said Bobby Brown in a statement issued by his lawyer Christopher Brown.

Brown was taken to North Fulton Hospital in Roswell, a suburb north of Atlanta, police said.

Doctors put her in a medically induced coma, according to CNN and other media, all of whom quoted a single source close the family, but the hospital would not confirm those reports or give any updates on her condition.

Bobbi Kristina Brown was hospitalised twice with anxiety after her mother's death.