SAN DIEGO – Police have released surveillance photos of four suspects who attacked two University of San Diego students outside their home in Mission Beach early Saturday morning.

According to San Diego police, the attack, which was partially caught on surveillance video, occurred at 2:30 a.m. in the 700 block of San Luis Place. The two male victims were involved in a verbal altercation with four people, three males and a female.

At one point, the victims tried to run away, but one of them identified as Corbin Kirk, tripped and fell. Kirk hit his head on the pavement. Kirk’s attacker then jumped him and stomped his head, leaving him unconscious, police said. He suffered a brain bleed and a concussion. 10News learned he later underwent emergency brain surgery.

Neighbor Marty Zimmerman who came to Kirk’s aid following the attack, said Kirk was beaten so badly he thought Kirk was dead.

“It made me sick to my stomach, it really did,” Zimmerman said.

What prompted the fight between the two parties was not immediately confirmed.

The suspects were all described as white and in their early 20s. The three males were all around 5-foot-10 to 6-feet tall. Their descriptions are as follows:

Suspect 1: Normal build, brown hair, full beard, wearing a burgundy t-shirt, light colored pants, and black shoes.

Suspect 2: Thin build, brown hair, wearing a black hooded sweatshirt, long sleeved white t-shirt, black shorts and black shoes.

Suspect 3: Thin build, brown hair, wearing a black hooded sweatshirt with “High Times” written on the back, brown pants, and black shoes.

Suspect 4: White female, with a thin build, wearing a light colored t-shirt and black shorts.

Anyone with information should call San Diego police at 858-552-1700.