Protesters marched on the offices of Kenya¡¯s election commission on Tuesday, demanding a speedy investigation of the murder of a senior official that has raised fears over the legitimacy of next week¡¯s national elections.

Chris Msando, the election board¡¯s head of information, communication and technology, was found murdered on Monday. He had been tortured before he was killed, authorities said .

Msando oversaw the live transmission of election results, a contentious area that the opposition has said could be used to rig next Tuesday¡¯s presidential and parliamentary polls.