BUDAPEST, Hungary (CNN) -- A principal and teacher were killed Wednesday when a masked gunman opened fire in a private elementary school in Budapest, Hungary's capital city, police said.
The lone gunman entered the private school in the 21 district of Budapest at 6:40 p.m. (12:40 p.m. ET) and started shooting arbitrarily, Budapest police spokesperson Endre Kormos told CNN. There were no children in the school at the time.
Both men were killed and a security guard was injured. The guard was shot in the hand and taken to the hospital, police said. Police set up checkpoints around the city to try to track down the gunman and issued a reward of 5 million Forints (about $26,000) for public assistance in the case.
CNN's Per Nyberg and journalist Fanny Facsar contributed to this report.