Naples, March 6 - Naples prosecutor Giovanni Colangelo on Wednesday said he is treating the fire that destroyed Citta' della Scienza, a scientific museum complex on the outskirts of Naples, as a case of possible arson. "We took samples from various parts of the site and sent them to police forensic labs", said Colangelo, who visited the burned-out location with Italian Justice Minister Paola Severino. There were no fatalities in the blaze that consumed the science complex on the night between March 4 and 5. Built on a converted former steel plant, Citta' della Scienza included a planetarium, an interactive museum, an exhibition hall, a conference center and offices. It was considered among the best scientific museums in Europe, and had 350,000 visitors a year.