Sunday Night producers end up in 'punch up'

By Michael Lallo and Natalie O'Brien
Updated November 1 2014 - 5:13pm, first published 4:39pm
Mark Llewellyn from the current affairs series <i>Sunday Night</i>.
Mark Llewellyn from the current affairs series <i>Sunday Night</i>.
Mark Llewellyn from the current affairs series <i>Sunday Night</i>.
Mark Llewellyn from the current affairs series <i>Sunday Night</i>.
Mark Llewellyn from the current affairs series <i>Sunday Night</i>.
Mark Llewellyn from the current affairs series <i>Sunday Night</i>.

An internal investigation is under way into an alleged fight at the head office of Channel Seven's Sunday Night program earlier this week.