Shocking Footage has emerged of the moment a high-rise building in the Iranian capital Tehran collapsed while on fire, trapping dozens of firefighters inside. <br /><br />The video, filmed earlier today, shows the 17-storey structure, formerly one of Iran's highest, falling to the ground as smoke billows out of several floors. <br /><br />According to reports, around 200 firefighters were battling the blaze in the building this morning, when it suddenly collapsed. <br /><br />As many as 25 were reportedly trapped inside and are feared dead. <br /><br />More 200 people have also been injured in the incident.