It all started with a ‘‘snap’’ yesterday afternoon.Soon after, a broken strut, which connected the roof to a central beam, was seen to be disconnected, leaving the western grandstand’s roof to droop at either end.Emergency services moved in about 3.15pm, blocking access while engineers and police set up a makeshift command post in a nearby demountable building used by on-site construction workers.The nearby Steelers Club was evacuated for fear the roof could flip onto the club building.Curiosity brought onlookers to the limit of the police cordon. "Must be those footpath engineers," one police officer quipped.options={AutoRewind:false,AutoStart:false,Player:"flv",Speed:"low",Width:463,Height:260}Wollongong police commander Superintendent Kyle Stewart said a structural engineer was on scene to assess damage."Until we have the formal report from the structural engineer, we’re rendering the environment unsafe," he said.By 6pm stadium lights were switched on as police and engineers inspected the structure from a safe distance in the stadium’s northern grandstand.The man who had long lobbied for the construction of the building, Illawarra Venues Authority chairman Chris Christodoulou, said the roof sheeting, as well as the main support structure, had buckled under the wind gusts.On hearing news of the situation, construction unions began demanding answers."I will be seeking to get an urgent telephone conference with the relevant unions and we would be looking for a report from WorkCover in the first instance as to what happened," South Coast Labour Council secretary Arthur Rorris said last night."We need a specialist investigation and people with the credibility to undertake those investigations. We need to know the status of the building and we may well take our own action."This morning, Mr Rorris said the CFMEU was expected to recommend all work on the new grandstand stop until an investigation was completed.‘‘It’s looking like other than the immediate remedial work and the structural safety work that needs to be done, it certainly looks like the recommendation will be that no further work be done until we get a recommendation from our principal affiliate, which is the CFMEU,’’ he said.Throsby MP Stephen Jones said that after the structure was deemed safe, work should begin to get to the bottom of the issue."We need to look very quickly at a thorough inquiry into both the materials and the work," he said."I would be deeply concerned if government money was used for the purchase of substandard materials for an important regional facility."Around 60 per cent of the steel used to construct the grandstand came from Victorian manufacturer OneSteel and the remaining 40 per cent from China.Others, including Wollongong Lord Mayor Gordon Bradbery said they were simply thankful nobody was hurt."I’m just glad it happened when the stadium was not occupied," he said."That’s one blessing."