Reports of sexual assaults increase on college football game days, according to a recently released study.

The study called “College Party Culture and Sexual Assault,” which was published on the National Bureau of Economic Research website, finds that reports of sexual assault spike by 28 percent.

The study also noted jumps in the instances of DUIs and public drunkenness, which coincide with the study pointing a finger at alcohol as a culprit.

Alcohol is involved in as many as half of sexual-assault cases, according to the National Institute on Alcohol Abuse and Alcoholism.

Isaac Swensen, a professor in the department of Agricultural Economics and Economics at Montana State University, told USA TODAY College that an unexpected revelation in the study showed the probability of a sexual assault on game day being carried out by a stranger rose by 61 percent.

That goes against the grain of most sexual assaults, which are acted out by people the victim is familiar with.