Two men are being sought by UK police after suspected CS tear gas was set off during a fight on a train in London today.
The incident, involving a group, occurred on a Tube train carriage at Oxford Circus, central London, the BBC reports.
Several people were treated by paramedics at the scene after experiencing coughing and shortness of breath.
"Symptoms suggest the gas was CS gas," British Transport Police said on Twitter.
There are no further concerns for their health, they said.