KEY POINTS
  • Singapore's competition watchdog said the merger has "substantially lessened competition" in the market.
  • Uber sold its Southeast Asia business to ride-hailing rival Grab in March.
  • The Competition and Consumer Commission of Singapore (CCCS) raised concerns, saying it has reduced competition and led to increased fares.
This photo illustration taken on March 26, 2018 shows the Grab and Uber booking application seen on a smart phone in Singapore. 

Singapore's competition watchdog on Thursday proposed fines on Uber and Grab and said they may have to unwind their merger because of "substantially lessened competition" in the market.

Uber sold its Southeast Asia business to ride-hailing rival Grab in March. The move saw the -based company acquiring a 27.5 percent stake in Grab and Uber CEO joining the firm's board.