World News Update, what you need to know

Canadian police have arrested a female student after six students and two workers were stabbed at a high school near Toronto.

ELSEWHERE:

LONDON - At least one person has been killed and three others are missing after a building collapsed at a disused British power plant.

BOULDER - A Colorado jury has convicted a woman of attempted murder and assault for stabbing a pregnant stranger and cutting her foetus from her womb, after luring the victim to her home with an online advertisement for free maternity clothes.

FRANKFURT - Mars Inc has recalled chocolate bars and other products in 55 countries, mainly in Europe, after a piece of plastic was found in a Snickers bar in Germany, the US confectionery maker says.

STOCKHOLM - A Swedish doctor, who abducted a woman and kept her locked up in a bunker for almost a week has been sentenced to 10 years in prison, but was acquitted of aggravated rape because of a lack of proof.

THE HAGUE - A commuter train has derailed after slamming into a crane that was crossing the tracks in the eastern Netherlands, killing the train's driver and injuring seven passengers.

LONDON - Bill Gates is siding against Apple in saying the firm should help the US government to hack into a locked iPhone as part of an investigation into the San Bernardino shooting, which left 14 people dead.