(Reuters) - Nokia declined to comment on Thursday on a media report saying it was working with an investment bank to defend itself from a hostile takeover, news which sent its shares sharply higher."Nokia does not comment on market rumours," said a spokesman for the company.Earlier on Thursday shares in Nokia surged 12.5%, with traders pointing to a report by online newspaper TMT Finance that said the group was working to defend itself from a hostile takeover bid for parts or all of its..