Las Cruces police arrested a third suspect in connection to a Friday night mass shooting at Young Park that left three teens dead and injured 15 other people.

The third arrest is a 17-year-old boy, according to the City of Las Cruces. He joins another 17-year-old boy and 20-year-old Tomas Rivas, who police arrested on Saturday. All three are accused of three open counts of murder. Additional charges against all three are pending.

Rivas was booked into the Doña Ana County Detention Center early Sunday morning. He is initially being held without bond. The 17-year-old suspects are incarcerated in the juvenile section of the detention facility. Police are not naming them because they are minors.