of Segni. Colleferro continued growing throughout the 1920s and 1930s with still within the municipality of Valmontone. In 1935 Colleferro was incorporated as a new city. Later, Colleferro incorporated portions of the neighboring municipalities of Segni and Paliano. On 1 February 1938 there was the worst ever explosion at the Bombrini Parodi Delfino (BPD). The number of dead and wounded and the damage was so severe that the news was reported even in the British Times. Within about three hours with of the explosion, the king, Victor Emmanuel III, Benito Mussolini, along with government and military officials, were in Colleferro to see what happened, visiting the wounded, and planning what to do for the wounded and the town. During World War II, the Allies repeatedly bombarded Colleferro to destroy the explosives factory. During the attacks, citizens found shelter in a series of caves and tunnels built under the "BPD Village". In the early 1950s, BPD manufactured Lauryl, the first soap powder in Italy. On 9 October 2007 one person was killed and eight were injured in an explosion at a weapons factory belonging to Italian company Simmel Difesa. Twinning Colleferro is twinned with: Colmenar Viejo, Spain Main sights Colleferro is home to the following churches: Santa Barbara Church of the Immaculate Church of San Bruno Church of St. Joachim Temple of Santa Barbara Church of St. Benedict Temple of Saint Anne The air-raid shelters, residues of World War II, where some 1,500 civilians found shelter during the bombing, most of the "refuge" is still open on the feast of St. Barbara (4 December), patron of the country. Economy Agriculture The territory has always been an agricultural vocation. From 2006 is in the "Rural District and the Valley of the agro-energy Latin. As part of the redevelopment of the Valle del Sacco was initiated an experiment in "non-food crops (crops not for food). The crops will be sunflower for the biodiesel and poplars to power boilers biomass. As for the 'livestock, the environmental crisis had forced the slaughter of livestock and destruction of health protection for milk in all farms in the area. The farm has since rebounded with numerous protections for consumers. Industry The development of Colleferro is linked from the beginning to its industrial, with the opening of explosives Bombrini Parodi Delfino (BDP), to which were added numerous chemical plants and textile. The industrial area of Colleferro spread over