The man who gunned down five people at Northern Illinois University (NIU) in a suicidal rampage became erratic after halting his medication, authorities said today.

The former student who gunned down five people at his old US university in a suicidal rampage had recently “become erratic” after halting prescribed medication, it emerged today.

Another person shot when a suicidal gunman opened fire at an American university has died, bringing the toll to six.