New rules could be introduced at Tower Bridge after a bottle was dropped causing the top layer in the glass walkway to shatter.
The walkway opened to the public for the first time two weeks ago with the manager saying he was "gutted" about it smashing but emphasised the public was never at any risk.
The dizzying walkway allows you to see the river Thames more than 40 meters beneath your feet.
The glass was smashed last night after a bottle was dropped followed by a woman wearing stilettos standing on the crack.
But there are a further five layers of glass underneath.
The pane has been covered in a mat until it is fixed tomorrow night.
In the 120 years that Tower Bridge has been standing, the globe has seen two world wars, six British monarchs, 22 Prime Ministers, the moon landings and the digital revolution.
To celebrate, it is opening its doors to visitors for £1.20 on the anniversary date.
A special sunset reception will also be held for 120 competition winners on its lofty walkways.
The world famous bridge was officially opened on 30th June 1894 in a special ceremony by the then Prince of Wales who later became King Edward VII.
At the time, The Times Newspaper reported that it was "reckoned among the greatest engineering triumphs of the Victorian age."
Five women had to be taken to hospital, while a man and a girl made their own way to get medical treatment and two other women were checked at the scene but didn't need any further help.
One of the women was taken as a priority to Royal London Hospital with pelvis and head injuries, while the other injuries sustained were described as minor.
Nine people have been injured after a pleasure boat crashed into Tower Bridge. The Millennium City Cruises vessel collided with the north side of the famous London bridge at around midday.
The Met have confirmed that the leader of the English Defence League has been charged with public order offences after a rally yesterday.
Tommy Robinson, whose real name is Stephen Yaxley-Lennon, tweeted about his charges earlier in the day.
Over 160 people were arrested for a variety of offences after the far-right group's march through central London yesterday.
Most of the arrests were for breaching the conditions police had set down for where the rally could take place, and included people from rival anti-racist and anti-fascist groups who were prohibited from coming in to contact with the EDL's route.
English Defence League leader Tommy Robinson has been arrested after the far-right group's rally yesterday in East London.
He was among 14 people taken into custody for public order offences - some of those from anti-racist and anti-fascist groups who were protesting against the march.
A further 150 people were arrested for breaching conditions police had set in place about where the rally was allowed to take place.
The EDL had wanted to hold the rally in Tower Hamlets, which it says is "subject to Sharia law". But the Met Police only allowed the rally to go as far as the outskirts of the borough near Tower Bridge, over fears of serious public disorder.