By Kate Augusto and Ricky Thompson

At least nine Northeastern students were arrested in Mission Hill early yesterday morning on various alcohol-related charges, police and school officials said.

An additional 20 to 30 students were reported to the Office of Student Conduct and Conflict Resolution, said Jeff Doggett, director of government relations and community affairs, who was accompanying police at the time of the incidents.

The incidents occurred at three spots during the course of an hour, starting with a 12:28 a.m. stop at 142 St. Alphonsus St.

Boston Police Department (BPD) officers observed about 30 to 40 people inside the location, including many who were in possession of alcohol, police said.

Officers arrested Justin Yost, 22, Andrew Medeiros, 22, and Anthony Totire, 21, and charged them with keeping a disorderly house. A fourth student was arrested and charged with possession of alcohol by a minor.

“You can’t get them all, but in all cases, we did catch some of the students who were trying to leave out the back door,” Doggett said.

At 12:41 a.m., police responded to a complaint about loud music at 1548 Tremont St. and noticed empty beer cans scattered throughout the apartment. Julia Burkhardt, 21, and Kyle Siconolfi, 21, were arrested and charged with keeping a disorderly house.

Police found a similar sight at 89 Hillside Ave., responding to a 1:33 a.m. complaint about loud music. Officers arrested Brandon Holley, 19, Kevin Borer, 20, and Michael Conry, 20, and charged them with keeping a disorderly house.

Benjamin Van Selous, 19, was arrested on the same charge but his enrollment at Northeastern could not be confirmed as of press time.

“In all of the cases, they had the same thing happening,” Doggett said. “People were out in front of the building, out on the back porch and were loud enough that we could hear them from the street. All had woken up neighbors, who called the police, and that’s how we responded.”

Doggett said the students who were arrested said they were aware Boston police would be cracking down on underage drinking in the neighborhood.

“The university and the neighbors have done a lot of work to try and educate students on how to act appropriately,” he said. “We can’t just continue to say that we’re going to do things and not follow-up.”