MOSCOW — Russian investigators say a teenager attacked a teacher and opened fire with an air gun in a classroom in a Moscow suburb.

The Investigative Committee said in a statement a 15-year old boy walked into a full classroom in the suburb of Ivanteyevka earlier on Tuesday with the gun hidden under a raincoat.

The teacher was hospitalized with a brain injury. A student who jumped out of the window suffered a fracture, while two others who jumped had bruises. There was no indication that anyone was shot.

The suspect was detained, the investigators said. They did not identify a motive for the attack.

Russia, unlike the United States, has strict gun control laws, and it was not immediately clear how the teenager got hold of the weapon.

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