An explosion in a passageway near the main train station in Augsburg, Germany, early Wednesday morning left two teenagers injured and prompted a major police operation, temporarily closing the regional transport hub, according to officials and media reports.

Police said the unidentified object exploded at around 3:15 p.m. local time, causing minor injuries to a 17-year-old girl and an 18-year-old man, both Ukrainian citizens, as reported by the German news agency dpa. The German newspaper Die Zeit reported that the two suffered "acoustic trauma" from the blast. Windows were shattered and several businesses, including a bank, sustained minor damage, according to reports.

Police spokesperson Timo Küfner told The Associated Press that an explosion occurred in a passageway near the station, and later a second suspicious object that did not explode was discovered right at the main train station, leading to the shutdown of the station at 8:30 m. The object was later identified as harmless, and the station reopened at 10 m.

"We can give the all-clear — the object we found in front of the main train station was harmless, and we have reopened the station," Küfner said. He added that trains were running again and that "it's still too early to say anything about a possible motive for the overnight explosion, but we are investigating."

Explosives experts from the Bavarian state criminal police office were investigating at the scene, and road traffic and public transportation in the vicinity were disrupted in the early morning hours.

German media reports offered differing details on the nature of the device. Bild reported that a hand grenade detonated in front of a jewelry store and that the train station itself was apparently not the target. The Augsburger Allgemeine newspaper reported that a bomb disposal robot was dispatched to the scene. Police said on X that "train services have been suspended" and that "a major police operation is currently taking place" in the area, with several streets closed and public transport disrupted. They added that "an explosion of an unknown object occurred in a building passageway" and advised the public to "avoid the area widely."

Local media reported that police are exploring a possible connection to organised crime, though this has not been confirmed.

Augsburg, a city of 308,000 residents in Bavaria, about 78 kilometres northwest of Munich, is a regional transport hub, according to reports.

The incident comes as German government officials on Tuesday blamed Russia for an attempted attack at Leipzig/Halle Airport last month using a drone laden with explosives. Germany announced that it would shut down a Russian consulate among other measures against Moscow. The drone was found near a Ukrainian plane and was defused. German officials said the incident posed a new level of danger. Moscow has been widely accused by Western officials of running a campaign of sabotage and disruption across Europe with the aim of undermining support for Ukraine and destabilising European nations.