A Spanish examining magistrate has asked Interpol to join the investigation into last month's crash by a Spanair aircraft at Madrid airport, El Pais daily reported Saturday.
The judge would like to discover if Spanair had violated international safety regulations, the report said.
The magistrate would like to find out what regulations the US and European aviation authorities stipulate for MD-82 aircraft, the type of Spanair craft that broke up after take-off and burst into flames on August 20 at Madrid airport, reported dpa.
A total of 154 people died in the crash, and 18 survived with injuries.
Investigators said the plane had taken off without its flaps extended. The cockpit alarm system also failed.
The examining magistrate would like to know from Interpol what international regulations govern the testing of the alarm system.
Planemaker McDonnell Douglas made the recommendation in 1987 that the alarm should be tested before each take-off.
Spanair was carrying out the tests at the start of the day and when the cockpit crew changed, the report said.