[14][15] The band's pyrotechnics, consisting of sparkler firework candles, ignited the club's flammable polyurethane acoustic foam, and the fire spread rapidly.

[18] Overwhelmed by the high number of victims, Romanian authorities transferred some of the seriously injured to hospitals in Israel, the Netherlands, Belgium, Austria,[19] the United Kingdom, Norway, Germany and France.

[21] In advance of the concert, the band announced that they would be including customised lighting, "pyrotechnic effects",[22] and scenic elements brought in to "give life to the science fiction artwork" of the new album.

On 29 October 2015, on Facebook, Goodbye to Gravity announced that they would be celebrating the release of their album Mantras of War with a free concert in Club Colectiv the following night.

Bogdan Enache, the band's drummer, died on 8 November, shortly after the plane that transported him from the Burn Hospital to a clinic in Zürich, Switzerland, returned to Otopeni airport, because he had entered into cardiopulmonary arrest.

[41] When the ceiling caught fire, the approximately 200 to 400 people in the club panicked and rushed to the only working exit door at the venue, creating a stampede.

The State Secretary at the Ministry of Health, Raed Arafat, and deputy Prime Minister Gabriel Oprea arrived at the scene late in the night.

[47] Intervention crews worked with 75 special vehicles of the Inspectorate for Emergency Situations, including 11 with water and foam, and 57 SMURD trucks and ambulances.

[61] Another 184 people were injured, most of them young, and of whom 146 required immediate hospitalization, including four foreigners: an Italian woman, two Spanish citizens, and a German man.

[88][89][90] One of those injured in the fire at the Colectiv club was Viorel Andrei Bud,[91] winner of bronze and silver medals at the International Mathematical Olympiads in 2013 and 2014.

[92] Romania's president, Klaus Iohannis, wrote on his Facebook page that he was "deeply grieved by the tragic events that happened this evening in the center of the Capital".

[95] Halloween concerts and parties scheduled for that evening were cancelled across the country,[96] and a campaign on Facebook urging people to avoid clubs and bars that night, and intended both to show respect to the victims and as a form of protest against inadequate safety precautions in such establishments, garnered over 100,000 supporters.

[104] In a national telethon organized by Intact Media Group, €1 million[105] was raised in donations from viewers and companies, including Carrefour, Coca-Cola HBC AG and Rompetrol.

[108] Some artists include Connect-R, Delia, Carla's Dreams, Marius Moga, Dan Bittman, Voltaj, Andreea Bănică, Alina Eremia and Lora.

[109] Two of the victims, Claudiu Petre and Adrian Rugină, were knighted to the National Order for Merit posthumously by President Iohannis for their efforts to save others in the fire.

[110] Between 9 and 16 November, the Romanian General Inspectorate for Emergency Situations conducted more than 1,000 inspections at national level, in bars, venues, clubs, cinemas and malls.

In October 2015, he lost the Social Democratic Party leadership to Liviu Dragnea amid a tax fraud scandal, and became the country's first sitting premier to stand trial for corruption.

[131] On 4 November protests continued for a second consecutive night despite Ponta's resignation, with about 35,000 people in Bucharest,[132][133] 10,000 in Timișoara, 5,000 in Craiova and Iași, 4,500 in Cluj-Napoca,[134] 4,000 in Sibiu, 3,000 in Bacău, Constanța, Buzău and Galați, and 1,000 in Focșani.

[168] Interim Prime Minister Sorin Cîmpeanu had stated that Romania had not triggered the mechanism because the Club Colectiv tragedy had not fitted the formal definition of disasters.

[172] Four days after the tragedy, German DJ Markus Schulz sent a public message on Facebook, announcing to his fans that he will no longer hold concerts accompanied by pyrotechnics, also expressing his sympathy for the victims and their families.

[175] On 25 November, before their concert at Arenele Romane in Bucharest, the heavy metal band Sepultura saluted survivors from the Colectiv nightclub fire and expressed their regrets.

[176] On 11 December, after their concert in Bucharest, members of the Finnish rock band Nightwish visited several survivors of the nightclub fire at the Grigore Alexandrescu Hospital.

I hope they didn't wash it with solvent.A team of specialists from the National Institute for Research and Development in Mine Safety and Protection to Explosion arrived in Bucharest to investigate the causes of the fire.

[190] Director of Golden Ideas Fireworks Artists SRL, Cristian Niță, and others employed in this company that provided pyrotechnic effects in Club Colectiv were intercepted while discussing the destruction of evidence.

[191] According to intercepted communications, one of the company's employees contacted director Cristian Niță the day after the fire, asking him to remove a number of relevant documents from the computer.

[195][196] To my knowledge, Niță Daniela Ioana talked with Adrian Rugină [Digidream representative] on Thursday evening, 29 October 2015, to meet on Saturday to sign the contract.

The rental agreement stipulated that Goodbye to Gravity had to pay a rent of €500 should they fail to gather a crowd of at least 400, in which case the consumption from the bar would have been sufficient to cover the costs.

The newly appointed prime minister, Dacian Cioloș, reacted: "ISU Bucharest leadership must be dismissed, they no longer belong to the system".

[201][202][203] Prosecutor General's technical juridical expertise, released three months after the fire, revealed that no control of Sector 4's City Hall took place in five years.

Moreover, use of incompliant, inflammable materials, lack of emergency exits and construction deficiencies hampering evacuation (the verge was higher by 7 cm [2.8 in]) were among the main causes of the tragedy.