CAIRO -- Egyptian authorities have arrested six people over a deadly crash this week at Cairo's main train station that killed at least 25 people.
The country's top prosecutor ordered late Thursday that those arrested — two train conductors, their aides and two other rail workers — remain in custody for four more days pending further investigation.
Wednesday's crash also left at least 47 injured.
Prosecutor General Nabil Sadek earlier said the investigation determined the accident was triggered by a brawl between two conductors.
He says one conductor failed to put the brakes on before leaving the locomotive, unleashed the speeding, unmanned engine which then crashed into a concrete barrier at the Ramses station in downtown Cairo, setting of a huge explosion and fire.
Transportation Minister Hisham Arafat resigned after the accident.