The victims of 9/11 have been honoured in New York with 2,977 light-up drones recreating the Twin Towers. The drone show over New Yorks's harbour on Wednesday, formed the outline of the towers, with one for each person who died in the attacks. Titled 2,977 Lights Over New York Harbor, the display was held to mark the 25th anniversary of the September 11 attacks, when al-Qaeda terrorists flew planes into the Twin Towers. The memorial was developed in collaboration with survivors, victims’ family members and first responders to 9/11.