YESTERDAY : Police continue to search for a man who went missing in the Brisbane River at Karana Downs yesterday afternoon.
At around 2.15pm, a 21-year-old man entered the river from Kookaburra Park and failed to return.
A Queensland Water Police vessel and two other vessels are being used to search the body of water in the Kookaburra Park vicinity.
The search also continued overnight.
Police would like to advise that Kookaburra Park, including the water-area, is closed to all public especially those launching or using any watercraft.
There is no further information available as police continue the search.
Anyone with information which could assist with this matter should contact Crime Stoppers anonymously via 1800 333 000 or crimestoppers.com.au 24hrs a day.
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UPDATE: A young man is missing, feared drowned, after he swam across the Brisbane River yesterday to fetch a ball which had landed in the water.
Water police and emergency services officers were still searching for 21-year-old Ipswich man Benjamin Reddich as night fell.
Mr Reddich was at Kookaburra Park at Karana Downs with friends when he dived into the river to retrieve the stray soccer ball about 2.20pm.
Jake Mann, an acquaintance of the missing man, said Mr Reddich swam about 10m from the eastern bank of the river before things took a tragic turn.
"He just went down," he said. "You could see him going down so we jumped in and started swimming over.
"His head surfaced for a moment, then went under again. We didn't hear him yelling or see him thrashing in the water or anything - he just sank."
Springfield Lakes father-of-two Darryl Whitehead was fishing with his sons when he too saw the young man suddenly disappear.
Mr Whitehead, a marine biologist, said it appeared as if Mr Reddich had drowned from "pure exhaustion".
"When I saw him go under, I took of my shirt and jumped in after him," he said.
"By the time I made it a quarter of the way out to where he was, about three others were swimming to help. "Apparently one of those swimming to his aid was his girlfriend who was screaming out his name."
Mr Whitehead said the water's current was "pulling like crazy".
Members of the public with water craft soon joined the search and rescue operation before police and emergency services arrived.
As of yesterday evening, Queensland Fire and Emergency Service's swift water rescue team and water police were continuing the search.
District duty officer Senior Sergeant Bob Phillips said there was nothing to suggest sharks were involved in the incident.
SUNDAY, 2PM: A SEARCH is continuing for a 21-year-old man feared drowned in the Brisbane River at Karana Downs.
Emergency services rushed to Kookaburra Park after a man disappeared below the water while retrieving a ball.
The call for help was received shortly before 2.30pm.
Bystanders used boats to search for the man before help arrived.
Queensland Fire and Rescue Service crews and water police are on the scene and swift water rescue personnel are in the water.
More updates to come.