In a marshalling yard, operator error caused a perforation in back of a tanker car. A 63-ton cloud of isobutane dispersed over a zone spanning 800 m by 1,200 m. The ignition occurred between 8 and 10 min after the rupture of the car. The explosion killed 7 employees, and 349 injuries were reported, including 33 among the personnel. Windows were shattered up to 4.8 km away; a total of 700 dwellings were damaged within a 5-km radius, in addition to 11 public buildings. Major structural damage was recorded out to a distance of 1.6 km. Another 283 other tanker cars were totally destroyed and 312 damaged. The TNT equivalent of the blast was evaluated at between 20 and 40 tonnes.