Uber Technologies’ deal to sell its Southeast Asian operations to rival Grab, announced earlier this week on Monday, is drawing flak from Singapore’s Competition Commission since it allegedly violates the country’s competition rules.

On Friday, Singapore’s antitrust regulators said, it had grounds to believe that ride-services firm Uber Technologies Inc’s efforts to sell its Southeast Asia operations to its peer Grab is in violation of the country’s competition rules.

As a result, Singapore’s Competition Commission has commenced an investigation into the deal and has proposed interim measures that requires Uber and Grab to maintain their pre-transaction independent pricing.

Earlier this week, U.S. ride services company Uber Technologies stated it will be retreating from Southeast Asia and will sells its operations to its rival Grab.