SAN FRANCISCO (CBS SF) — Police in San Francisco late Thursday afternoon confirmed that two people have been arrested in connection with the shooting at an Excelsior District high school earlier this week that left four students injured.

Four suspects were seen fleeing the site of the San Francisco high school shooting Tuesday afternoon.

Police said they responded to a report of shots fired in front of 325 La Grande Avenue Tuesday, which is the campus for both the June Jordan School for Equity and City Arts and Tech High School, at around 3:17 p.m. as both high schools were letting out for the day.

Upon arrival, police found three students – two males and a female all 15 years old — had been wounded in a shooting.

The three injured students had run back into the school bleeding after being shot in the parking lot.

The female student was struck in the torso and was initially reported in critical condition with life-threatening injuries. A police spokeswoman said the girl’s condition has been upgraded to serious but still life-threatening on Wednesday.

A fourth student showed up later at the Bayview police station with injuries from the shooting.

The school was placed on lockdown to make sure there was no active shooter on site.

“We did the best we could and we provided a safe space immediately,” said June Jordan Principal Jessica Huang.

Three students suffered non-life threatening wounds, but the teenage girl who was shot in the torso was rushed to the hospital with critical injuries.

While police confirmed the two arrests, they did not offer any additional details about the two people taken into custody or where the investigation stood in terms of finding the additional two suspects who were still at large.