The authorities in both countries are no longer investigating the case.
Salvador Martínez confirmed that the Army, State and Federal Police are looking for them.
The bodies were so badly burned that only tests like DNA or dental records could identify them.
Adam Coleman and Dean Lucas were travelling in a van.
There will be no altar on the Nov. 1-2 Day of the Dead observance for Mauricio Ortega, who was 18 when he and the other students were taken away by police in the city of Iguala on Sept. 26, 2014.
Parents of the 43 student teachers missing since Septermber 26, 2014 demand justice to the authorities.
They discussed the progress in the investigations into the disappearance of the students in September last year.
English09/07/2015
DJ Dash Berlin found safe
"I'm ok my Mexican friends, keep you posted." the DJ wrote on Facebook.
"It has been a couple of hours since Dash Berlin went on a bike tour in the Mayan jungle. On the way, he left the group and so far his location is unknown." his team reported on social networks.