Young people from Hammersmith Boxing Club were at the Houses of Parliament in Westminster when shots were fired on Wednesday afternoon.
The students from Ealing, Hammersmith and West London College were at the House of Commons ahead of an event.
They were among other schoolchildren and kitchen staff evacuated and are said to be shocked but fine.
Westminster attack
Earlier today, EHWLC tweeted: "Today our students from Hammersmithbox will be at the House of Commons for the launch of Year 2 of Be Lion hearts project!"
Press Association reporter Laura Harding, who was in Westminster at the time of the incident, said: "Everyone has been evacuated into Central Lobby, including a group of schoolchildren and kitchen staff.
"Around 15 schoolchildren aged around 10, with armed police coming through the lobby now.
"The children are really calm. The teachers are comforting them.
"Everyone is standing around on their phones.
"There are also a bunch of young people from the Hammersmith Boxing Club in their tracksuits and the British Lionhearts boxing group."
Reports have surfaced that two people have been shot during a police incident outside Parliament.
The Metropolitan Police said: "Officers - including firearms officers - remain on the scene and we are treating this as a terrorist incident until we know otherwise."
Parliament is on lockdown while police deal with the incident.
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