SAN JOSE, Calif -- Three juveniles were in custody Tuesday night in San Jose after being arrested for a vicious attack on two young boys out trick-or-treating on Halloween night, authorities said.

One boy who was shot is still in grave condition in the hospital.

Some business owners told KTVU the attack still has everyone on edge.

Lam Nguyen, the owner of PK Market on Story Road in East San Jose said it is scary coming to work now.

On Halloween night, Nguyen helped two boys who were attacked near his store. A 12-year-old boy was shot in the head and a 13-year-old boy was stabbed trying to help his friend, according to police

The attackers escaped.

"To me [I’m] kind of worried not only for myself -- my business -- and also for the community over here,” said Nguyen. “Everybody's worried about it."

Tuesday, San Jose police said they arrested all three people involved in the attack.

The suspects are juveniles: two 16-year olds and one 15-year-old. Police said all three are confirmed gang members.

Police did not reveal details or why they believe the attack was gang related.

At Mathson Middle School where the two victims are currently enrolled, the principal said grief counselors met all day with students.

"They wanted to know 'Are we safe?' And we had to tell the kids that it did not happen on school grounds or anywhere near the school grounds,” said Mathson School Principal Orlando Ramos. “That was first and foremost: 'Are we safe?’"

Some students were also angry because they said the two boys were not involved in gangs. They don't believe the attackers mistook the boys for gang members.

"They saw their faces before they did it and they actually stopped them before they did it,” said one friend of the victims, Francielis Lajara. “So they talked to them and they knew who it was."

Nguyen was just glad the arrests were made.

“It's a relief for the community and also for the businesses around here," said Nguyen.

San Jose Mayor Chuck Reed plans a community meeting about the attacks.

The 12-year-old gunshot victim remains hospitalized in grave condition; the 13-year old is now recovering at home.