Deputy Chief Jason Moen with the Auburn Police Department spoke to our media partners in Portland, WGME, earlier Tuesday evening.
Police said, two brothers, ages five and nine, from Auburn were playing near the river when one boy accidentally fell into the water around 7:00 p.m.Tuesday.
Police stated the older brother jumped in to try to save his brother.
Deputy Chief Moen said the boys' father also tried to save the boys but was not successful.
Auburn firefighters were able to recover the nine-year-old, who was flown by life-flight helicopter to Maine Medical Center in Portland. Authorities said he is in critical condition.
The parents are currently with the nine-year-old.
Police have not yet released the identities of the people involved.
They said the search for the five-year-old will continue in the morning.
The incident is under investigation.