A 43-year-old nurse has admitted to trying to kill her 15-year-old daughter to collect life insurance money, police sources said Wednesday.

The suspect, Yukiko Sakanaka, was arrested Sunday on suspicion of attempting to kill her eldest daughter, a first-year high school student, by giving her tea laced with an asthma drug on two occasions in May while the girl was hospitalized.

"I had her consume the drug because I wanted her insurance money," Sakanaka was quoted as saying by the sources.

Sakanaka is the beneficiary of life insurance policies on her eldest daughter worth 30 million yen.