KEY POINTS
  • Britain's competition regulator says Amazon's investment in Deliveroo "raises serious competition concerns."
  • The U.S. tech giant led a $575 million funding round for Deliveroo earlier this year.
  • Both Amazon and Deliveroo have defended the investment.
A food delivery cycle courier waits for orders from Deliveroo, operated by Roofoods, in London, U.K., on Dec. 22, 2016.

Amazon's investment into food delivery service Deliveroo raises antitrust concerns and may need further investigation, the U.K. competition regulator said Wednesday.

The U.S. tech giant led a $575 million funding round for the London-based start-up earlier this year. While the exact value of Amazon's stake hasn't been disclosed, reports have said the company invested $500 million into Deliveroo as part of the deal.