WALDORF, Md. (WJZ) — A 7-year-old girl and her father are dead after they drowned in a back yard pool at a birthday party in Waldorf.

It happened at a home in the 1200 block of Jefferson Lane around 6:00 p.m. on Saturday.

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The Charles County Sheriff’s office said the child fell into an in-ground pool in the back yard and began drowning.

Officers said the child’s father and a 17-year-old boy jumped in to help but both began drowning, as well.

When police officers and EMS crews arrived, they immediately pulled all three from the water and began CPR.

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The child and her father were later pronounced dead at a nearby hospital.

The teen was transported by helicopter to a hospital in Washington D.C. for treatment.

The Charles County Sheriff’s office could not comment on his condition as of Saturday night.

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CBS Baltimore Staff