rtokens: All those detained appeared to have been freed , the spokesman said .
pos: NNP RB VBD PRP VBD DT NN , WDT PRP VBD VBD VBN DT NN IN DT NN .
tokens: Iran subsequently said it regretted the incident , which it said had been the result of a misunderstanding .
ltokens: The Iranian ambassador was also summoned to the ministry in Bonn to hear a sharp protest and " disapproval of this glaring breach of the principles of international law " , he added .