(LONDON) — At least 15 people are dead and another 23 injured after a streetcar derailed in Portugal’s capital on Wednesday, officials said.

At least five people are in serious condition following the crash in Lisbon, according to the city’s communications department.

One 3-year-old child is included in the 23 injured, according to an official.

It appears the safety cable on the electric streetcar broke, causing the car to derail, the department said, based on preliminary information.

Carris, the operator of the streetcar, said that all maintenance protocols were complied with, including daily inspections.

The mayor of Lisbon declared a three-day period of mourning.

“I offer my sincere condolences to all the families and friends of the victims. Lisbon is in mourning,” Mayor Carlos Mo

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