A viral clip of the incident on March 1 shows the seat landing on the ground floor below, narrowly missing shoppers passing by.
Days after the incident, police launched an investigation after it was reported yesterday (March 3).
A 14-year-old boy and a 16-year-old were arrested on suspicion of criminal damage and remain in custody.
No injuries were reported following the incident.
Inspector Dan Window, from Stratford Neighbourhood Policing Team, said: “Police are investigating after a heavy seat was thrown over a barrier from the first floor of Westfield shopping centre in Stratford on Saturday.
“The seating was reported to have narrowly missed members of the public below, fortunately there were no injuries.
“The matter was reported to police on Monday (March 3) and enquires continue.”
In a statement shared by Newham MPS (@MPSNewham) on X, said: “This was a serious incident and we would encourage anyone who may have further information to contact the police ref: CAD 5623/04Mar.
“Alternatively you can contact the independent charity Crimestoppers anonymously on 0800 555 111.”
