32-year-old man kills 3, injures 4 in 4-hour shooting spree in US' Chicago

The US Police shot dead 32-year-old Jason Nightengale after he killed three people and injured four others during a series of shootings that lasted for around four hours. The shooter kept moving during the attacks that started in Chicago and ended just north of the city, the police said. The investigators are trying to determine the motive behind the attacks.