Thames Valley Police officers are in Slough tonight (25/7) following a report of a man in the Jubilee River.
At 7.25pm today, the force received a report that a man had entered the water near the weir at Windsor Road and experienced difficulties while swimming.
The man, who is believed to be aged in his early twenties, was with a group of friends and was not seen to get out of the river.
Officers have been carrying out enquiries and search activity on the riverbank to attempt to locate him.
They have also been working closely with the Royal Berkshire Fire & Rescue Service.
The man is approximately 6ft, has dark brown hair and was wearing denim shorts with no top on at the time he went missing.
Inspector Michelle Kneale, based at Maidenhead police station, said: “I would like to speak to anyone who saw a man in difficulties in the river or who has any information about this incident. If anyone saw a man matching the description of the missing man leave the water, please inform the police.
“We are extremely concerned for this man’s welfare and are continuing our extensive enquiries to locate him as soon as possible.
“I would also like to remind everyone not to swim in the river – there is a weir in this part and the currents are extremely dangerous. As tempting as it may be in the warmer weather, rivers contain hazards below the water’s surface which sometimes cannot be seen, so I would urge everyone to always think carefully about staying safe.”
If you have any information about the incident, please call the 24-hour Thames Valley Police enquiry centre on 101, quoting the reference 1285 25/7.