In April 2015, construction was temporarily suspended by Brazil's Ministry of Labor and Employment, claiming a "grave and imminent danger to the physical safety of workers." The ministry cited their concerns for "the absence of collective protection", and risk of workers falling, in addition to lack of security, no technical report on the stability of slopes at the site, and what was described as a potentially hazardous "accumulation of material". The temporary suspension added even more stress on the construction's timetable, with works being sped up significantly afterwards, with the Organising Committee stressing that "work was back on track." Unfortunately, delays proved to be a valid concern, when cycling test events originally scheduled to take place at the Velodrome on 18 – 20 March 2016 were rescheduled to 29 April – 1 May, due to a delay in the installation of the velodrome's track. Blame was put on poor conditions for the installation of the Siberian-sourced timber, which could potentially lead to the wood warping and bending. It was by then that President of the UCI Brian Cookson made public his concerns about the completion of the venue, bluntly stating to the media, in a press conference after the 2016 UCI Track Cycling World Championships, that completing the venue in time for test events in late April was "a challenge", and that "if the velodrome is not ready in time, there is no plan B."