The six were shot on Tuesday shortly after a group of Mohave High School students got off a school bus in a working-class neighborhood in northeastern Las Vegas. Police were searching for at least two suspects later in the day.

An 18-year-old man was in critical condition and a 17-year-old boy was upgraded from critical to serious condition, both with gunshot wounds to the torso, said Cheryl Persinger, a University Medical Center spokeswoman.

Four people including at least two boys and a girl who are under 18, were treated for gunshot wounds to their arms and legs and were released, she said. All four are students at Mojave High School who had just stepped off the bus, which was coming from the school, police said.

Authorities would not release any other information about the two victims who were still hospitalized including whether they were students or had been on the bus.

Police said they believed the shooting was linked to a fight at Mohave earlier in the day. The brawl had been contained by school police, who arrested three male students, officials said.

Sheriff Doug Gillespie did not describe how he believed the incidents were connected. The fight at the school did not appear to be gang or race-related, he said. “At this point, the indicators that we have found... it’s a dispute over a girlfriend,” Gillespie told reporters.

Police believe the suspects were waiting at the bus stop for the bus to arrive. Gillespie said the shooting did not appear to be random.