Investigators continue to search for the suspects behind last weekend's deadly mass shooting in Newark, New Jersey.

Two law enforcement sources tell CBS News New York a vehicle believed to be connected to one of the suspects was pulled over Monday night after a chase on Route 280. Sources also say two weapons were discovered in the car, but investigators have not said whether they are connected to the shooting. Several people were detained, but they are not believed to be involved in the shooting, according to sources.

The Essex County Prosecutor's Office says the Homicide Task Force is working around the clock to capture the person, or people, responsible.

Remembering the victims of the Newark mass shooting

Surveillance video shows the victims standing outside a liquor store on the corner of Leslie Street and Chancellor Avenue around 7 p.m. Saturday before gunmen open fire on the sidewalk. 

The gunfire killed 10-year-old Jordan Garcia and 21-year-old Kiyah Mae Scott, and injured three others, including Garcia's 11-year-old brother, Essex County prosecutors said. 

Family and friends were to release balloons in Garcia's honor at 5 p.m. Tuesday on the football field at Vailsburg Park. His father said he was a beloved football player in Newark's youth program, and he and his brother were walking to the recreation center from a nearby store at the time of the shooting. Family members said the brother suffered a wound to the stomach.

Roger Leon, Newark's superintendent of schools, spoke at an interfaith service Tuesday and called the violence senseless.

"We mourn the loss of one of our students [and] a woman who was killed, and we continue to pray for the recovery of those who were wounded, which includes another one of my students," Leon said.

Annette Ryan, Scott's mother, said that she now has to bury her second daughter after losing another to cancer in 2018, and that Scott also leaves behind a son.

"Kiyah was very outgoing, loving to her family and friends," Ryan said Monday. "She loved her son dearly. Very smart, knowledgeable. She had a lot of wisdom. She was very smart."  

"We are coming"

Officials held a news conference Monday, calling on the community to come together and for those responsible to turn themselves in. 

"It's clear on what needs to happen, that these perpetrators need to turn themselves in immediately -- before the sun goes down tonight, would be preferable -- that you turn yourselves in as soon as possible," Newark Mayor Ras Baraka said, adding, "The community is on alert, on lookout, and we will make sure that justice is done."

Essex County Sheriff Amir Jones has offered a $10,000 reward for information leading to an arrest in the case. 

"What you did was cowardly, heartless and unforgiveable. You shattered families and shook an entire city. You proved nothing but your own weakness. So hear me clearly, we are coming, there is no hiding, there is no running, there is nothing that will change what's coming. There is no corner of this county, no block, no basement, no friend's couch that will keep you hidden," Jones said.

The crime has shaken the city in the wake of police working hard to lower the number of shootings and homicides.

Ryan had a message for the person who killed her daughter.

"You reap what you sow. Everybody has family. You may be the one that may be sitting in my seat one day," Ryan said.

In an online post, Garcia's father said he never imagined having to bury his son because of gun violence.

"To know that my child walked out of a store and was met with gunfire -- something so violent and so unnecessary -- breaks me to my core. I can't stop thinking about what he might have felt in those final moments," he said.

Check back soon for the latest updates on this developing story.