An unknown object exploded near a train station in the southern city of Augsburg in the early hours of Wednesday, German police said, adding that two passersby aged 17 and 18 sustained minor injuries.

The blast occurred in a building passageway, Bavaria state police said, adding that the injured individuals were two Ukrainian citizens.

Hours later, police added that the city’s main train station was closed after an additional suspicious object was found there.

“Train services have been suspended,” police said on X.

News outlet Bild reported that early in the morning, a hand grenade detonated in front of a jewelry store and that the train station itself was apparently not the target.

A police spokesperson said details on the explosive device remained unclear.

Augsburg is a regional transport hub around 55 kilometres (35 miles) northwest of Munich.