Dallas police say a DJ's playing of a gangsta theme song sparked violence that led to deadly gunfire during a birthday party.
Two people were killed and four were hurt in the attacks early Sunday outside the El Angel nightclub.
Authorities believe two gangs had declared a truce during the celebration.
But then the song was played -- "Put Yo Hood Up."
Twenty-two-year-old Lendl Carey and 20-year-old Kenneth Haggerty were fatally shot.
The four people who were wounded were treated and released from a Dallas hospital.
So far no arrests.