Phoenix, Arizona (CNN) - Police say two people were killed and four others were wounded in a drive-by shooting outside a birthday party in phoenix early Sunday.
The 18-year-old birthday boy and a 16-year-old boy were killed.
Another 16-year-old was hospitalized in extremely critical condition, while a 17-year-old and 18-year-old had life-threatening injuries.
A 21-year old man was also shot, but did not have life-threatening injuries.
All the victims were male.
Police say the party, which allegedly included underage drinking, was breaking up early Sunday morning.
That's when someone drove by and opened fire on a group of people who were leaving.
Authorities are still looking for the shooter.
There's no word yet on the motive.