A French nurse has been arrested and questioned about the death of thirty elderly patients in her care.

The nurse, Christine Malevre, has been released on bail, awaiting a decision on whether she should stand trial for murder.

The prosecutor said she was given bail because there had been no formal complaint from the families of the patients.

Some reports say the nurse told police she killed the old people at their own requests or those of their relatives to end their sufferings.

The French legal code does not recognize the concept of euthanasia.