BETHLEHEM, Pa. — Lehigh University has temporarily suspended two fraternities and warned two others they could face discipline for unspecified alcohol-related incidents.

The eastern Pennsylvania school says Phi Kappa Theta and Delta Chi are barred from organized activities and “impromptu social gatherings” while the school’s Office of Fraternity and Sorority Affairs investigates the incidents, which allegedly occurred during the first week of the fall semester.

Alpha Tau Omega and Kappa Alpha were issued warnings.

None of the fraternities has commented on the actions.

Vice Provost of Student Affairs Ricardo Hall says the school had more police and alcohol-related events this fall than last fall, and that Greek social events contributed to the problem.

Lehigh disbanded another fraternity, Kappa Sigma, through July 2019. That happened two months ago after a spate of alcohol-related issues.