Hong Kong 's police charge two ferry captains with manslaughter . Follows fatal ferry collision Thursday that left two people dead . Involved passenger ferry and vessel carrying revelers to National Day fireworks . Narrow sea lanes leading into Hong Kong main harbor are some of the busiest in Asia .
Hong Kong police charge two ferry captains with manslaughter . Follows fatal ferry collision last year that left 39 people dead . Involved passenger ferry and vessel carrying revelers to National Day fireworks . Narrow sea lanes leading into Hong Kong 's main harbor are some of the busiest in Asia .