More related examples...
Bar patrons tackle and disarm gunman in pub before he shot...
http://www.breakingnews.ie/ireland/mhojcwojkfgb/
Football player tackles gungirl before she shot...
http://www.huffingtonpost.com/2009/0..._n_276388.html
Gunman tackled before shooting at school, disarmed...
http://www.nypost.com/p/news/regiona...gsvx5ElOj3EkNL
Texas Capitol shooter tackled by officers while reloading...
http://www.kwtx.com/home/headlines/82435837.html
Turns out the Casino shooter was tackled while he attempted to reload...
http://www.bismarcktribune.com/news/...4db54d96f.html
Convenience store robber jumped by unarmed patron once distracted, eventually wrestled to floor...
http://www.thisissomerset.co.uk/news...l/article.html
Two hostage women tackle gunman who threatened to set them ablaze, one was shot in the attempt, but the gunman was downed...
http://www.telegraph.co.uk/news/worl...le-gunman.html
Jack Ruby was tackled and prevented from shooting Oswald a second time, though the tacklers were mostly armed officers...
http://investigation.discovery.com/v...jack-ruby.html
Army sniper tackled by unarmed special forces guys after killing 1 and wounding 20...
http://edition.cnn.com/US/9510/sniper/am/index.html
Unarmed constable tackles assassin who had already killed several...
http://www.time.com/time/magazine/ar...904045,00.html