PHILADELPHIA (AP) 鈥 Police say eight Philadelphia high school students waiting to board a city bus after classes Wednesday were wounded by gunshots from suspects who jumped from a car and opened fire, the fourth shooting on the transit system in as many days.

The previous three shootings each involved a fatality. Those wounded at the bus stop included a 16-year-old who was hit nine times and was in critical condition, Kevin Bethel, the city鈥檚 police commissioner, said at a news conference. Police said later that a second victim was also in critical condition. The others were said to be in stable condition.

Bethel said the Northeast High School students, ranging in age from 15 to 17, were waiting for the bus around 3 p.m. when three people emerged from the car, which was waiting at the scene, and fired more than 30 shots. Police said the attackers were masked and the car was a dark blue Hyundai Sonata.

Police then received numerous 911 calls about a 鈥渕ass shooting on the highway near Dunkin' Donuts,鈥 in northeast Philadelphia, according to police spokesperson Tanya Little.

The injured teens were taken to Einstein Medical Center and Jefferson Torresdale Hospital, according to John Golden, a spokesperson for the Southeastern Pennsylvania Transportation Authority, or SEPTA. Two buses 鈥 a Route 18 bus and a Route 67 bus 鈥 were hit by gunfire, but there were no reports of injuries to passengers or the driver.

Northeast High School is more than a mile from where the shooting took place and the largest public high school in the city, with more than 3,000 students.

Monique Braxton, deputy chief of communications for the Philadelphia school district, said the shooting occurred near Crossan Elementary, which was dismissing students at the time but pulled them back inside and locked down. It later got an all-clear from police.

Mayor Cherelle Parker, standing at the scene with the city police commissioner and prosecutor and the school superintendent, said she wanted people to know that 鈥渨e will not be held hostage, that we will use every legal tool in the toolbox to ensure the public health and safety of the people of our city.鈥

Superintendent Tony Watlington Sr. said officials were 鈥渁bsolutely heartbroken and angry that innocent children walking home from school would be impacted by gun violence, and we agree with the mayor: Enough is enough.鈥

In the evening, police released surveillance camera video showing the Hyundai in a parking lot, its windshield wipers swiping back and forth. Suddenly three figures in dark clothing burst from the front passenger side and both rear doors and run across the lot, apparently toward the bus stop. Some people can be seen fleeing. A person apparently has remained in the driver鈥檚 seat and steers the vehicle part of the way toward the three, who return and quickly pile back inside. The car then speeds off.

The vehicle鈥檚 windows were darkly tinted and the license plate was unknown, police said. The car was missing an 鈥淗鈥 emblem on the front grill. The department asked for the public鈥檚 assistance in identifying the suspects but warned against approaching them.

The scene was cordoned off with yellow police tape in the aftermath of the shooting, with dozens of evidence markers lying on the rain-slicked pavement.

Neighborhood resident Jessica Healy, who was with her 2-year-old daughter, said the area has become more unsafe in recent years, and she has neighbors who are already in the process of moving due to previous incidents.

鈥淚 think it鈥檚 really sad and just dangerous that I don鈥檛 even want to walk my daughter out here,鈥 Healy said.

鈥淚t鈥檚 not safe. 鈥 I don鈥檛 like it here. I would like to move. But my boyfriend has a good job here, so this is why we stay,鈥 she added.

Another longtime resident, Brenda Keith, said she doesn鈥檛 take extraordinary measures to stay safe, other than being aware of her surroundings in case she suddenly needs to get away from trouble. She understands if people don鈥檛 feel safe in the city right now or are uneasy about riding SEPTA, but she's determined not to let shootings stop her from living her life.

鈥淏ut we鈥檙e not the only city that鈥檚 going through this. 鈥 I鈥檝e been here a long time and things have gotten worse, but that鈥檚 the way life is,鈥 Keith said.

Wednesday's shooting followed shootings the previous three days in which someone was killed while riding, entering or leaving a SEPTA bus.

Tuesday's shooting occurred around 6:35 p.m., when police said a verbal argument and then a physical fight began. One of the two passengers exited, turned and fired two shots from a 9 mm handgun, hitting a man later identified as 37-year-old Carmelo Drayton. He died shortly afterward at a hospital.

The shooter, who officials said was wearing one of the kinds of masks not allowed on the transit system, fled. Authorities were investigating possible motive, and no other injuries were reported.

SEPTA鈥檚 chief of transit police, Charles Lawson, said the shots were fired at the victim while the driver was 鈥渋mmediately behind.鈥

On Monday, a and four other people were wounded when gunfire erupted at a bus stop. The victims included two women who were riding on a bus.

And on Sunday, around 11:30 p.m., a 27-year-old man was killed by another passenger moments after they both got off a bus. Witnesses said the two had argued, but a motive remains under investigation.

No arrests have been made in any of the shootings, Frank Vanore, deputy commissioner of the Philadelphia police department, said Wednesday.

While serious crime overall is down along the transportation system, Lawson said, a pattern that has emerged over the past year and a half is people carrying weapons, usually illegally, getting into an argument and then opening fire. He vowed that officials would enforce crime aggressively and unapologetically and use 鈥渆very legal means at our disposal to target illegal gun possession.鈥

鈥淲e鈥檙e going to target individuals concealing their identity. We鈥檙e going to target fare evasion. We鈥檙e going to target open drug use," Lawson said. "We鈥檙e going to target every criminal code on the books.鈥

Officials are increasing monitoring of security cameras and looking into ways to let employees report potential problems discreetly and safely, Lawson added.

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