UPDATE 6:10 P.M.: All four people have been rescued from the Delta in Pittsburg, fire crews said on Twitter.
The four are being transported to the hospital with hypothermia.
The Coast Guard helped with the response.
PITTSBURG (KRON) — Contra Costa Fire is currently rescuing two adults and two children at the Pittsburg Marina, according to a tweet by the department.
The Water rescue is currently underway. Fireboat 85 is responding with rescue personnel at 51 Marina Blvd.
The call came in about the rescue at around 5:22 p.m. Friday afternoon. Crews discovered an overturned jet ski.
No other information has been made available.
Stay with KRON for updates on this breaking news story, on-air, online, and on the KRON4 app.
— Confire PIO (@ContraCostaFire) May 14, 2016