A police report has revived an investigation into four former ETA leaders regarding the T-4 bombing. The report highlights that only members of the executive committee of the group could have given the order to plant the bomb. This development comes during a time when negotiations with the government were ongoing.

The police report sheds new light on the incident, focusing on the potential involvement of high-ranking ETA members. Further details about the investigation and the police report can be found in the original source, El País, for those seeking more information on this matter.