Twin brothers drown in backyard pool in Calif.

VISALIA, Calif. – Fire officials say 1-year-old twin brothers have died after falling into a backyard swimming pool at a Northern California home.

Fire Battalion Chief Danny Wristen says the boys were found by their mother in the pool around 12:20 p.m. Friday.

The mother pulled the boys out and began CPR. Wristen says paramedics took the boys to a hospital, but they died after arriving at the hospital.

Authorities have not released the names of the boys or of their mother. Wristen says there was no fencing around the pool, and the incident is being investigated.

The drownings Friday come after a 16-month-old drowned in a family pool outside of Visalia in April.