Woman injures three people in third Poland school knife attack in a week

The 21-year-old used a "dangerous object" to attack a 17-year-old girl at an educational institution in the capital, Warsaw, police told news agencies PAP and AP.

Interior Minister Marcin Kierwiński also said a 17-year-old was detained in the town of Sierpc, north-west of Warsaw, after allegedly stating "on school grounds that he planned to do something...

Authorities told local media that the 17-year-old injured on Saturday had been taken to hospital, but her condition was not life-threatening.