DES MOINES, Iowa – four more teens have been charged in the murder of the 15-year-old on March 7, in a shooting that took place outside a school in Des Moines, officials reported on Tuesday.

“BREAKING: more arrests made in the drive-by shooting outside of East High School last month.

Des Moines Police detectives charging suspects in a range of one count of murder – 1st degree and 2 counts of attempted murder,” Tweeted Anchor Samantha Mesa.

The murder charges on the teens came following arresting six others in connection with the killing of Jose David Lopez, 15 when two other girls also got injured but luckily survived. The authorities said the four teenagers are being charged with ‘first-degree murder and two counts of attempted murder.’

“One teenager has died and two others are in critical condition after a shooting on the grounds of East High School in Des Moines, Iowa. Police say several potential suspects are in custody and there’s no word yet on the motive,” CBS Evening News Tweeted on March 8, a day after the incident.

The shooting incident happened earlier in March “along the edge of the East High School campus,” located near downtown Des Moines.

The latest arrest of the four teens took place after the authorities reviewed CCTV footage, surveillance videos and interrogating the suspects and their relatives. Moreover, officials retrieved 42 shell casings from the area of the incident and found out that a total of six firearms had been used.

“The teens were identified using nearby residential camera footage,” Des Moines Register Tweeted.

The latest arrests include, Gumaro Marquez-Jacobo, 18, Daniel Hernandez and Braulio Hernandez-Salas, both 17 and Kevin Isidro Martinez, 16. All of the suspects belong to Des Moines.