Investigation launched into Paris tourist killing as suspect with previous terror plot released from prison

France's anti-terrorism prosecutor has opened an investigation into the killing of a 23-year-old German-Filipino tourist near the Eiffel Tower in Paris. The suspect, who had been under surveillance for suspected Islamic radicalization, recorded a video pledging allegiance to the Islamic State group. The attacker also injured two other individuals with a hammer before being arrested. The incident has raised concerns about security ahead of the upcoming Olympic Games in Paris.