A Vietnamese woman has given birth to twins with different fathers.
Doctors treating her say the remarkable case - defined medically as a set of bi-paternal twins - is extremely rare.
The twins, who are now two years old, were born the same day and are the same sex.
However their 34-year-old father underwent DNA testing after being pressured by his family because the children did not look alike.
One has thick wavy hair while the other has thin and straight hair, the online newspaper Dan Tri reports.
To rule out a hospital mix-up, DNA testing of the mother revealed she was the mother of both children, the report said.
Professor Le Dinh Luong, president of the Genetic Association of Vietnam, said DNA testing at his Hanoi lab confirmed the twins have different fathers.
He explained bi-paternal twins could occur if two eggs from the same mother were fertilized by sperm from two different men within a seven-day ovulation period.
If a woman have more than one sexual partner within seven days when she is ovulating,there is a chance different sperm cell can fertilize two different eggs
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