Panaji, Dec. 8 -- Twenty-five people, including four from a Delhi family, were killed and six injured after a massive fire ripped through a nightclub in the coastal village of Arpora in north Goa around 11.45pm on Saturday, officials said on Sunday, with chief minister Pramod Sawant adding that electrically detonated pyroguns likely caused the deadly blaze. A combination of factors - key safety lapses, including inadequate number of exits and use of pyroguns, a thatched roof and stacks of alcohol - intensified the fire, causing it to engulf the 300 square metre establishment, Birch by Romeo Lane - an Island Club, in a matter of minutes. Twenty of the victims were staffers at the club, while five were tourists, according to a statement issued by the Goa Police. Four people were arrested following the registration of an FIR: Chief general manager of the club Rajiv Modak, 49; gate manager Priyanshu Thakur, 32 - both residents of Delhi; bar manager Rajveer Singhania, 32, and general manager Vivek Singh, 27 - both residents of UP. According to eyewitnesses, at least 200 people were inside the club when the incident occurred. It could house up to 500 people. "It started when a belly dance performance was underway. The performers used some cold pyro sticks which upon ignition leapt skywards and came in contact with the ceiling made of bamboo, fibre and straw-type material. This caused some sparks and fumes on the roof and within a few minutes, the whole place was burning," one of them said, requesting anonymity. Jayesh Diukar, who works at the club, said he managed to escape as he worked in the live kitchen section of the club on the ground floor. "The nightclub has two kitchens - the main kitchen is in the basement and the live kitchen near the main dining area," Diukar was quoted as saying by local media. By late evening, police had identified all 25 deceased while the post mortem examination of 12 had been completed. Five bodies were handed over to the families. The deceased tourists were identified as Saroj Joshi, Anita Joshi, Kamla Joshi and Vinod Kumar, all residents of Delhi and from the same family while a fifth tourist was identified as Ishaq (single name) from Karnataka. Four of the staffers came from Nepal, three from Jharkhand, five from Uttarakhand, three from Assam, two from Maharashtra, 2 UP and one from West Bengal. Goa DGP Alok Kumar said that police have dispatched teams to Delhi to arrest Saurabh Luhtra and Gaurav Luthra, directors of the Being Bharat Romeo Lane Hospitality LLP and other unnamed partners, managers, events' organisers and others. The fire started on the ground floor, leaving those in the basement trapped and unable to escape. According to officials, there were two narrow bridges to and from the venue whose width allowed only a single file of people. "Within 45 minutes, our police and fire departments were at the spot. It was difficult for the fire department to reach the spot because of obstructions on the way. The fire was brought under control within half-an-hour. Initially, the teams discovered only two bodies at the top level. However, when they reached the basement, they found the rest of the 23 bodies," Sawant said. The nightclub is located along the Arpora River backwaters and did not have a fire certificate. It is surrounded by water with only a narrow bridge leading to the main dance floor and restaurant, due to which firefighters had to park their tenders about 400 metres away from the spot, delaying the efforts, said officials....