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Italian authorities said that a high-speed passenger train has derailed in northern Italy, killing two railway workers and injuring 27 people. 

The train struck another train on tracks near the town of Lodi, said civil protection chief Angelo Borrelli on state radio. One of those dead was a train engineer, Euronews reported. 

Rai state TV said that the other train involved is a freight train.

Borrelli said the high-speed train departed from Milan at 5:10 am CET and was on its way south. He said two of the injured were in serious condition, while the other 25 were less seriously injured.

The train was travelling at around 180 kilometres per hour when it smashed into the other train.

The cause of the crash is under investigation. It wasn't immediately clear which of two trains the dead railway workers were aboard.

"Everything will be investigated," said Marcello Cardona, the prefect of Lodi. He called the situation grave.