RABAT, Oct. 16 (Xinhua) -- A train derailed Tuesday in northern Morocco, killing seven passengers and injuring 125 others, official sources said.

The train, which connects northern cities of Casablanca and Tangier, derailed at 10:10 a.m. local time (0910 GMT) in Sidi Bouknadel, a small town situated between the cities of Salé and Kenitra.

Causes of the accident are still unknown, Mohamed Rabie Khlie, the director of Moroccan national rail operator ONCF, said, adding that investigations are underway to determine the exact circumstances of the accident.