Update: The father of the 5-year-old boy was arrested late Monday night. An updated version of the story can be found here.

Original post: A 5-year-old boy was taken to the hospital Monday after he was found unconscious in a bathtub at a home in East Hollywood.

The Los Angeles Fire Department responded to an apartment building on the 4000 block of Marathon Street for a report of an unconscious person around 1:10 p.m.

An ambulance was called to the scene to take the unconscious child to the hospital. A spokesperson for the Los Angeles Police Department later confirmed that the child was a 5-year-old boy whose condition was unclear.

By 8 p.m. Monday evening, LAPD officials confirmed that the boy had died. The boy’s grandfather identified the boy as Mason Reyes.

At this time no arrests have been made and fire officials said the person calling to report the unconscious child was not with him at the time, but instead was calling from a different location.

Police later confirmed that the boy’s father was detained for questioning, but he has not been arrested.

A neighbor told KTLA that police visited the apartment on Sunday, although the purpose of the visit is unclear.

The investigation is ongoing.