A man reportedly fell into the water along Clarke Quay on Sunday afternoon, and search operations were still ongoing more than a day after the authorities were called.
The police said they were alerted at 2.55pm on Sunday to a case of a 27-year-old man who had gone missing at 3D, River Valley Road.
"A search to locate the man is still ongoing," a police spokesman told The Straits Times yesterday.
The man, who is understood to be a Singapore citizen, had reportedly fallen into the water near Read Bridge.
The Singapore Civil Defence Force (SCDF) received a call for help at 4.25pm on Sunday and deployed a fire engine, an ambulance and three support vehicles, it said.
On arrival, SCDF conducted a surface search along the Singapore River, with the help of a boat from a private operator.
Two divers from SCDF's Disaster Assistance and Rescue Team conducted underwater search operations in the area, but the man was not found.
At 11pm yesterday, SCDF said it was still conducting search operations. The search continues today.
According to a report yesterday by Lianhe Wanbao, the man's family realised he did not return home and was missing, so they called the police around 3pm on Sunday.
The incident occurred outside the Hot Stones restaurant, Wanbao reported.
Close to 30 police and SCDF officers were searching for the man on Sunday, and at least three eateries along Clarke Quay - including Hot Stones - were affected by the search as the area was cordoned off.
When The Straits Times visited the area yesterday at about 4pm, rescue personnel were still searching for the man, but no police cordon was seen.