Cause of Harlem blaze that killed FDNY firefighter remains unclear as marshals wait to enter building

Cause of Harlem blaze that killed FDNY firefighter remains unclear as marshals wait to enter building  New York Daily News Firefighter dies fighting blaze on New York set of Edward Norton film  EW.com The Latest: 9/11 group to donate $100K to firefighter family  Washington Post Blaze Erupts Beneath a Movie Set in Harlem, and a Firefighter Dies Rushing In  New York TimesFull coverage