By Suzan Fraser - The Associated Press

ANKARA - A passenger train slammed into a minibus at a railroad crossing in western Turkey, killing 15 people and injuring four just days after the deadly derailment of a Turkish express train.

The minibus — carrying 19 passengers returning from a wedding party — was rushing Sunday to cross the track on before the barriers came down, a railroad official told The Associated Press on condition of anonymity. No injuries were reported among some 200 train passengers.

The crash further highlighted concerns about the safety of the country’s aging rail network after the derailment Thursday of a new high-speed train en route from Istanbul to Ankara which killed 37 people.

Two other rail accidents were reported this weekend in Turkey: A 15-year-old boy was killed Sunday when he fell from a train traveling with its doors open in an Istanbul suburb, and four cars in a 25-car freight train derailed in southern Adana province Saturday. No one was hurt.

On Sunday German railroad experts examined the wreckage from last week’s derailment at the request of Turkish officials anxious to quell criticism that the government backed a dangerous high-speed rail project despite known safety risks.

The three-member German team was called in to conduct an independent inquiry into the accident, a Turkish rail official told AP, adding that Turkey also invited experts from other countries.

The crew chief of the express train, Koksal Coskun, and two engineers, Fikret Karabulut and Recep Sonmez, were arrested late Friday and reportedly face charges of negligence.