Madrid - One week after a Spanair MD-82 passenger plane crashed at Madrid airport, killing 154 people, the causes of the accident remain unknown, Spanish media reported Wednesday.
The pilot did not report anything to the control tower after take- off, the daily ABC said.
The plane hit the ground tail first outside the runway, according to a commission investigating the accident.
The tail then broke off and the plane bounced for 1,200 metres, hitting the ground three times and suffering increasing damage.