Four people were injured when a passenger riding on a Tokyo subway train accidentally broke a bottle of hydrochloric acid he was carrying, media and the train company said on Wednesday.
Television showed emergency vehicles and rescue workers outside the Nihonbashi station in the crowded centre of the Japanese capital. The Tokyo fire department said a strange smell had also been reported at another station in the capital.
The subway line was halted for a while, but later re-started, a spokeswoman for Tokyo Metro said.
In 1995, members of a religious cult released highly toxic sarin gas on the Tokyo subway, killing 12 and injuring thousands, some permanently.
