A firework was shot into a London bus sending frightened passengers running with fear.
Footage of the incident, posted on social media, shows the firework being launched towards the front of the bus, before sparks fly in the direction of passengers.
It happened on a bus travelling between Angel and Camden on Saturday evening.
Passenger Apostolos Filis told ITV News: "It was really sudden.
"No one was expecting the attack. They started attacking cars and bikes but then went on attacking the bus."
London Ambulance Service said no injuries were reported.
Steve Burton, from Transport for London, said: “This idiotic behaviour is extremely dangerous and will not be tolerated.
"We are working with Metropolitan Police to ensure appropriate action is taken.”
Metropolitan Police said the "anti social behaviour" is being investigated by officers from Islington neighbourhoods policing teams, and that enquiries into the incident were ongoing.
Police said fireworks were also discharged in shops and onto the streets.