A gunman shot dead a police officer and then apparently killed himself at Virginia Tech today, US police and school officials said.

Families of Virginia Tech shooting victims reacted with fury after it emerged that the gunman's missing mental health records were found at the home of a former campus clinic chief more than two years after the incident.

Victims of the shooting rampage at Virginia Tech college in the United States were “graduating” alongside their classmates tonight.

Within minutes of the Virginia Tech shooting massacre, online domain names related to the tragedy were snapped up by people hoping to sell them off for a profit or use them to link to advertisers.