and world record holder Robles brushed Liu's arm, causing him to trip on the final hurdle and finish in 13.27 seconds, behind Richardson, who clocked 13.16.
"Robles hit me twice, at the ninth hurdle he pulled at me but I'm sure it wasn't intentional," said Liu, who won 2004 Olympic gold and the 2007 world title.
"I lost my balance when I came to the 10th hurdle because of the bump. If not for the incident, I would have been the gold medallist."
European and Commonwealth champion Turner, who was removed from elite-level funding only two years ago after it was decided he was not capable of reaching major finals, struggled through the semi-final after a poor start.
DISQUALIFICATIONS AT THE 2011 WORLD CHAMPIONSHIPS
U Bolt (100m)
D Robles (110m hurdles)
C Ohuruogu (women's 400m)
D Chambers (100m)
A Razack R-S (400m)
M Zimmermann (20k walk)
G Restrepo (20k walk)
G Rubino (20k walk)
A Ibanez (20k walk)
J Cuddihy (women's 400m)
K Kim (100m, prelim round)
A Griffith (100m)
Y Camara (wom 100m prelim)
He was initially placed fourth in 13.44 and said: "I didn't want to win a medal by default, but I have won a World Championship bronze medal and I'm over the moon with that, although I'm still disappointed with how I ran it."
Britain's William Sharman finished joint-fifth with Aries Merritt, complaining straight afterwards about clashing with the American over the first two hurdles.
"I was capable of getting a medal - it's really frustrating," Sharman said. "I'm an ambitious guy and when there are eight equal individuals on the start line I'm not eighth so I'm pretty gutted about that.
"It's been a hard year and I haven't been able to train for a large part due to injuries."
American David Oliver, the fastest 110m hurdler this year, was not involved in the controversy, having hit the second hurdle and finished in a distant 13.44 for fifth place, later upgraded to fourth following the disqualification.
Meanwhile, in the women's 400m final
won Botswana's first ever medal at the World Championships.
Montsho held American Allyson Felix on the line to win in a time of 49.56 seconds, just 0.03 seconds ahead of Felix, with Russia's Anastasiya Kapachinskaya taking bronze in 50.24 and defending champion Sanya Richards-Ross seventh in 51.32.
Steve Cram's verdict on a dramatic night in Daegu (UK users only)
Also through to Tuesday's final are Belgian twins Jonathan and Kevin Borlee, Grenadan pair Kirani James and Rondell Bartholomew, Tabarie Henry of the US Virgin Islands, Jamaica's Jermaine Gonzales and Nigeria-born Femi Ogunode of Qatar.
In the last final of the evening
raced to gold in the women's 100m.
She made a superb start and finished in 10.90 seconds, beating Jamaica's Veronica Campbell-Brown by 0.07 seconds with Trinidadian Kelly-Ann Baptiste third.
earned a surprise gold medal in the hammer with a throw of 81.24 metres on Monday to give Japan its first title of the Championships.
And in the pole vault Poland's
took gold following a leap of 5.90m.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.