A man threatened an attack on a German high-speed train in western Germany and lightly injured several people before he was detained in the town of Siegburg, police said late Thursday.

So-called airsoft firecrackers exploded on an Intercity Express (ICE) train en route from Cologne to Frankfurt, a spokeswoman told dpa. The man was detained in Siegburg near Bonn.

The suspect had locked himself in a train toilet. German tabloid Bild reported that he had thrown the firecrackers into the corridor.

The train was evacuated. There was initially no information on how many passengers were on board.