Millennium Bridge, London people walking caused small sideways oscillations in the bridge, which in turn caused people on the bridge to sway in step, increasing the amplitude of the bridge oscillations and continually reinforcing the effect. On the day of opening, the bridge was crossed by 90,000 people, with up to 2,000 on the bridge at any one time. Resonant vibrational modes due to vertical loads (such as trains, traffic, pedestrians) and wind loads are well understood in bridge design. In the case of the Millennium Bridge, because the lateral motion caused the pedestrians loading the bridge to directly participate with the bridge,
2017 London Bridge attack in Vauxhall at 23:45 BST, causing Vauxhall station to be briefly closed; this was later confirmed to be unrelated to the attack. At 01:45 BST on 4 June, controlled explosions took place to make safe the attackers' bomb vests, which were found to be fake. An emergency COBRA meeting was held on the morning of 4 June. London Bridge mainline railway and Underground stations remained closed throughout 4 June, while Borough tube station reopened that evening. A cordon was established around the scene of the attack. London Bridge station reopened at 05:00 on Monday 5 June. Mayor of London Sadiq