The bloodshed took place in the philosophy department building of Charles University in the Czech capital, where the shooter was a student, a police official said.
Shootings
The official was not authorized to discuss details of the investigation publicly and spoke to The AP on condition of anonymity.
Patrick Crusius, who pleaded guilty to federal hate crime charges, could still face the death penalty for one of the deadliest mass shootings in U.S. history.
Two law enforcement officers were wounded in the shooting, and the city’s schools were put on lockdown.
Two of the victims in the fatal shooting were relatives of the alleged gunman, while the third was a McDonald’s manager.
Nine teenagers were found shot in an east Texas residence early Sunday at a prom after-party attended by hundreds, local officials said a statement.
Police say a former student shot through the doors of a Christian elementary school and killed three children after planning the massacre by drawing out a detailed map.
Eight people were wounded in the shooting, including a woman who was 28 weeks pregnant and lost her baby.
Officials say a suspect is in custody after the killings in a small town near the Tennessee state line.