The incident happened in the pre-dawn hours Wednesday in Ponte de Sor, central Portugal, following a brawl between local people and pupils at a nearby flight school where one of the twins is enrolled, the Portuguese media said yesterday.
A source close to the inquiry said the 17-year-old twin sons of the Iraqi ambassador in Lisbon, Saad Mohamed Ridha, were arrested but then released because they had diplomatic immunity.
The boy suffered a fractured skull and other extensive injuries and has been placed in an artificial coma, local media said.
The ministry will take "the necessary and appropriate measures... If the judicial authorities request it," the ministry said, pointing to the brothers' diplomatic immunity.
The Iraqi embassy could not immediately be reached for comment.