Gao Rui, suspect of a mass student poisoning taking place on May 19, is brought to an interrogation room at the Changchun Public Security Bureau in Changchun, capital of northeast China's Jilin Province, May 22, 2004. Gao Rui, suspect of the mass poisoning case, was detained by the police on Saturday. More than 140 students of the university were poisoned on May 19, and they have been discharged from hospital after medical treatment. The police said Gao Rui, a contractor of the student canteen, did so in retaliation against his competitor.

Gao Rui, suspect of a mass student poisoning taking place on May 19, is brought to an interrogation room at the Changchun Public Security Bureau in Changchun, capital of northeast China's Jilin Province, May 22, 2004. Gao Rui, suspect of the mass poisoning case, was detained by the police on Saturday. More than 140 students of the university were poisoned on May 19, and they have been discharged from hospital after medical treatment. The police said Gao Rui, a contractor of the student canteen, did so in retaliation against his competitor.