A spokeswoman for the German Foreign Ministry said Spain had accepted an offer for help from the BKA, but she could not confirm that four German citizens had died in the crash.
“We are trying to determine whether German nationals were involved,” she said early on Thursday.
Lufthansa said late on Wednesday that seven people bought tickets through the German carrier for the Spanair flight. Four of the passengers arrived in Madrid from Germany for the ill-fated connecting flight to Las Palmas in the Canaries.
The airline, which operates a code-sharing agreement with Spanair, was unable to confirm if any of the German-registered passengers were among the dead or if they boarded the flight. It said it had sent a team offering psychological help to assist the jet's operators Spanair deal with victims and families.