Please answer the following question: Please answer the following question about this movie plot. If it's un-answerable, please output "No answer". Question: Whose death causes the turf war to escalate? Movie plot title: Romeo Must Die Movie plot: Two rival gangs, one Asian, the other African American, are locked in a fierce and brutal turf battle, vying for control of Oakland's waterfront properties. But when the first casualty is the Asian warlord's son Po, the gang war becomes more dangerous than either side ever imagined.News of the murder gets back to Po's big brother Han (Jet Li - Lethal Weapon 4, Kiss Of the Dragon), a legendary ex-cop currently imprisoned in a Hong Kong jail. In a world of vicious rivalries and violent betrayals, Han has no choice but to escape and declare war himself. But unlike others, who can only use weapons, Han IS a weapon. And falling into his sightlines can be a deadly mistake.
Answer:
Po