Stanford University police are investigating back-to-back early-Sunday assaults in which one woman was tackled while walking on campus and another was attacked while sleeping in her dorm room bed.

Investigators don't believe the attacker was the same in both cases and noted that the victims managed to quickly escape and weren't hurt, said Sgt. Chris Cohendet of the Stanford University Department of Public Safety.

The first incident was reported around 1:45 a.m. by a woman who was tackled in Kennedy Grove between the faculty club and the humanities center on campus. She was walking home when a young man who smelled strongly of alcohol came from behind and knocked her to the ground. The man, described as Hispanic, in his 20s and wearing a red flannel shirt, bluejeans and a gray ball cap, didn't grope her and was quickly scared off by a passer-by. Police aren't sure if it was drunken roughhousing or a genuine assault.

About 15 minutes later in the Phi Sig residential house at 1018 Campus Drive, a student was awakened by a man who jumped into her bed and tried to take off her clothing, police said. A party was just ending at the house. The woman didn't know the attacker and managed to get out of her unlocked room. She called police Sunday afternoon and described the assailant as being a white man in his 20s who was wearing a dark shirt and a baseball cap.

"I was very surprised. Usually the campus is very safe and they do a good job of protecting us," Elizabeth Hancock, a Stanford freshman, told ABC-7 News.

"You don't think about that when you're going on your own way, but it happens," said Ariana Koblitz, a Stanford senior.

Anyone with information about the attacks is asked to call Stanford police at 650-329-2413.

Contact Joshua Melvin at 650-348-4335.