RIO DE JANEIRO, May 5 (Xinhua) -- A 13-year-old student opened fire Tuesday inside a school in the city of Rio Branco, the capital of Brazil's northern state of Acre, killing two staff members and injuring several students, local police said.

The suspect brought a gun from home and fired shots in the hallway leading to the principal's office, Felipe Russo, commander of the Special Operations Battalion of the Military Police of Acre, told local media.

The teenage attacker has been arrested.

Emergency services, including ambulances, police officers and forensic experts, have been dispatched to the scene for investigation and treatment of the wounded. ■