PARIS — French authorities have opened an investigation after a teenage woman allegedly live-streamed video of her suicide on the popular app Periscope.

The local prosecutor said Wednesday the young woman threw herself under a commuter train in the suburban Egly station, south of Paris.

The woman, whose name was not released, allegedly sent a text message to a close relation minutes before she killed herself Tuesday, prosecutor Eric Lallement said in a statement.

“She allegedly also made declarations to Internet users, through the Periscope application, to explain her act,” Lallement said.

The statement said the woman was born in 1997, meaning she was 18 or 19.

The video has been removed from the app, but YouTube users posted what they said were excerpts.

Periscope, owned by Twitter, did not publicly comment.