Fear in US state over armed woman 20 years after Columbine massacre

In 1999, two armed students entered Columbine High School in Colorado and shot dead 13 people before killing themselves. AFP PHOTO

LOS ANGELES: Nearly two decades after the infamous Columbine High School massacre, officials in the US state of Colorado were on alert Tuesday after learning of threats from a woman police say is 'armed and considered to be extremely dangerous.'