3 injured in knife attack at Polish school

Three people were injured in a knife attack at a school in Warsaw, the capital of Poland on Saturday, local media reported, the latest in a series of knife attacks at schools in Poland in recent days, reported Xinhua.

The attacker, a 21-year-old female student at the school, was arrested by police, Polish news channel TVN24 reported. One of the victims was taken to hospital with non-life-threatening injuries, while the other two sustained minor injuries.

On Wednesday, a 19-year-old student injured nine people in a knife attack at a school in Ostroleka, in central Poland's Mazowieckie province. A day later, a 15-year-old boy stabbed a school principal, a cleaner and a teacher at a school near Wyszkow in the same province. The 37-year-old cleaner later died of her injuries.