European Union regulators have opened an official investigation into Amazon’s proposed $1.7 billion acquisition of iRobot, the company behind the popular Roomba lineup of robot vacuum cleaners.

In a press release, the European Commission said it’s concerned that “the transaction would allow Amazon to restrict competition in the market for robot vacuum cleaners (‘RVCs’) and to strengthen its position as online marketplace provider.” The European Commission is also looking at how getting access to iRobot users’ data may give Amazon an advantage “in the market for online marketplace services to third-party sellers (and related advertising services) and / or other data-related markets.”

“We continue to work through the process with the...