A female Metropolitan Police officer is being investigated after being filmed chanting "Free Palestine" during a demonstration.
Clips of the officer were posted on social media which led to some users questioning whether she should have been expressing political views while on duty.
The force said its internal Directorate of Professional Standards is investigating what happened.
Pro-Palestinian demonstrators attend a protest following the Israeli-Palestinian violence, in London
Crowds of people marched through London on Saturday to the gates of the Israeli embassy, while protests took place in other cities across the UK and Ireland in solidarity with the people of Palestine.
A spokesman said: "We are aware of a video that has been posted on social media which shows an officer joining in with chanting while on duty at a demonstration.
"While officers are encouraged to positively engage with those attending demonstrations, they know they are not to actively p..