 Complete the following phrase:  On 6 October 2002, before a Seville derby against Betis at the Sánchez Pizjuán, four Sevilla fans, including a minor, assaulted a security guard. The attack was punished by Sevilla being forced to play their next four home matches behind closed doors, the longest term ever given to a La Liga side. The club finished in UEFA Europa Cup positions in both the 200304 and 200405 seasons before marking their centennial in late 2005. This set up Sevillas first-ever European triumph, the 