Two of the 12 killed in the collapse of the Texas A&M University bonfire stack were legally drunk, prompting an investigation by the state Alcoholic Beverage Commission.

Toxicology reports released on Friday show that the blood-alcohol level of two male students killed in the Nov. 18 accident exceeded the legal limit, the Bryan-College Station Eagle and the Dallas Morning News reported. The level of one student was nearly four times the .08 threshold, the newspapers said.

School officials have stressed that no evidence points to student misconduct as a factor in the collapse, which also injured 27.

"A few students drinking could not have caused that accident," said Bob Wiatt, the university's director of security.

Tests show that eight other students who died had not been drinking, while one former student had drunk a small amount. Toxicology results for the 12th student were not available on Friday.

Leo E. Linbeck, a Houston construction executive leading a separate, five-member investigative committee, said the toxicology reports will be added to the data already under review. The committee met for the first time on Friday.

Alcohol-related arrests long have been associated with the lighting of the bonfire, rather than the weeks leading up to the event, Wiatt said.

But in the past decade, law enforcement agencies cracked down on drinkers and student leaders urged other students not to mar the tradition with drinking, he said.

Those who worked on the project signed pledge cards promising they would not drink and climb on the bonfire stack, he said.