The French government is working on a smartphone app that could warn users if they came into contact with a coronavirus carrier, ministers have said, in a move likely to raise questions about the impact of tracing technology on civil liberties.

“In the fight against Covid-19, technology can help,” France’s junior tech minister, Cedric O, told the newspaper Le Monde in an interview. “Nothing will be decided without a broad debate.”

The minister said France was working on a project called “StopCovid” that could see the use of a proximity-tracking, bluetooth-based app that users would install on their mobile phone on a voluntary basis.

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