Police examining the remains of those killed in Spain’s worst train crash in decades have lowered the death count from 80 people to 78 and said the count could change as they identify body parts and associate them with others, The Associated Press reports.

Antonio de Amo of Spain’s national police said the change happened as forensic scientists have matched body parts with each other.

He told reporters Friday, July 26 that 72 bodies have been identified so far and that six remain to be identified.

Investigators, meanwhile, have taken possession of the “black boxes” of the train, which hurtled at high-speed along a curve and derailed on Wednesday.