On 30 October 2015, a nightclub fire which occurred in Bucharest, Romania, killed 64 people and injured 146 others. The fire was caused by a fireworks accident and is the deadliest such incident in Romanian history. It occurred during a free concert performed by the metalcore band Goodbye to Gravity to celebrate the release of their new album, Mantras of War. The band's pyrotechnics, consisting of sparkler firework candles, ignited the club's flammable polyurethane acoustic foam, and the fire spread rapidly. Most of the victims were poisoned by toxins released from the burning foam. Overwhelmed by the high number of victims, Romanian authorities transferred some of the seriously injured to hospitals in Israel, the Netherlands, Belgium, Austria, the United Kingdom, Norway, Germany and France. Mass protests over the corruption linked to the fire led to the resignation of Prime Minister Victor Ponta.