The 63-year-old was last seen around 8.30am on Sunday 23 January on a push bike in Riverhead Close, Southsea.
He has not been heard from since and his family are very concerned for his whereabouts.
Officers have been conducting extensive searches this evening and we are now turning to the public for assistance.
While they realise it is late on Sunday night, if you are out, then we would ask you to keep an eye out for Acoong – or you may have seen him at some point today.
He is described as being Asian, around 5ft tall and of slim build. He has short black hair and was wearing a dark jacket.
The bicycle had a basket on the back.
If you have seen Acoong, or have any information which may assist then please call 101, quoting the reference 44220030647.
