SALT LAKE CITY - Identical twin sisters from Utah each recently gave birth to twins — again.

Kerri Bunker and Kelli Wall delivered identical twins within weeks of each other at a hospital in Orem, south of Salt Lake City. Years ago, they gave birth to their first sets of (fraternal) twins, now 4- and 5-year-olds, at the same hospital a few months apart.

Bunker's second set arrived Feb. 13. Wall's youngest twins were born about three weeks earlier.

Ryan White, spokesman for Timpanogos Regional Hospital, says some of the twins were conceived through in vitro fertilization.

The 36-year-old women say they aren't just sisters but best friends, neighbours and co-workers. They are both teachers at the same school, and they married best friends.

READ MORE: After IVF surprise, mom gives birth to two sets of identical twins

Bunker and Wall say they see similarities in how their first set of twins interact and how they get along,

They say all nine kids will grow up together.

Bunker also has a 2-year-old child.