Two groups of young men led violent attacks on several Cal High students in San Ramon and Dublin last month, sending one boy to the hospital with severe head injuries, police said.

The senior boy who was badly injured was attacked with baseball bats at Village Green park behind the Le Asia market on Alcosta Boulevard around 7:30 p.m. on Jan. 31.

Juniors Erik Pliska and Taylor Navarro, and senior Geon Jang and the senior boy drove to the park after encountering two men at a nearby 7-11.

The two men followed the students and attacked them with wooden baseball bats once two of the students got out of their cars.

 Taylor said he fled the park while Erik and Geon remained in the car. 

Meanwhile, another group of men who had been at the park rose from benches and bushes and ransacked the car.

It is unclear whether these men are connected to the original attackers.

“They hit me across the eye socket and on the ear,” the senior boy said. “Then while I was on the ground, unconscious, they stomped on my jaw.”

Erik and Geon said they took the injured student to a friend’s house and then to the hospital, after which the police were notified of the incident, Officer Rob Ransom said.

The boy remained in the hospital for a day after suffering a broken jaw, and an injured ear. He needed 15 stitches above his eye. 

The Californian is not naming the injured boy because he is the victim of a crime. 

That same night at around 9:30 p.m., a group of young men confronted seniors Will Perschau, Christie Taylor, Sarah Yorkey, Sarah Weeks and a visiting friend while they were meeting up in San Ramon’s Central Park.

“They were African-American,” said Will. “There were ten of them. They looked in their late teens.”

The five Cal students were standing near The Community Center when they saw the boys head up a path toward them, said Christie. 

The four girls sprinted away toward Christie’s car and got in before seeing Will run across Alcosta Blvd into a residential area.

They then picked Will up in front of a house and waited 15 minutes before returning 

to the park to get the other girls’ cars.

“They tried to jump me and one punched me, but I ran fast enough and got away,” said Will. Will was punched in the jaw but did not sustain any major injuries.

While nobody in the group could say where the boys were from, they did not appear to be in a gang as they were not dressed the same or in the same colors, Christie said. Authorities have not confirmed if the two attacks were connected.

“The most upsetting part of it all was how hard it was to reach the police,” Sarah Yorkey said.

Immediately after the incident, Sarah said she called 911 just to find the line busy for a half hour. 

After she had called multiple times, someone finally returned her call asking if there was still an emergency.

“If someone had been seriously injured, what would we have done?” Sarah said.

Attacks on Cal High students such as these haven’t been reported in about two years, said Ransom. 

But as unusual as the incidents were, police cannot be sure whether the two groups of attackers were the same people.

So far, the main perpetrator in the attack on the injured senior boy was arrested and appeared in court last month.

Police said there is no clear motive in either attack.

“Listening to everyone makes me believe it was somewhat of a random thing, but not completely random,” Ransom said of the attack on the senior boy.

“There was some verbal exchange between the two groups, but no underlying issues,” Ransom continued. “Certainly nothing to warrant a beating with baseball bats.”

Both groups of students attacked feel shocked and disturbed that such an incident would happen .

“My mom was especially shocked that this would happen here,” said the senior boy. “San Ramon’s not safe anymore.”