The University of Sydney has sent letters to 13 people, including Associate Professor Jake Lynch, following an investigation into the heated confrontation between pro-Palestinian activists and pro-Israel activists at a lecture on the campus last month. In a statement the university said that letters had been sent to one staff member, five students, two university contractors and five members of the public. Lynch, the students and the contractors (believed to be security guards) are asked to respond to allegations that they "may have engaged in conduct that breached the University's Code of Conduct," the statement says. The five members of the public have received letters because their conduct "fell short of the standards required by the University of visitors to its campuses". The specific allegations, and the people they have been made against, have not been made public. Crikey understands that letters have been sent to people on both sides of the argument.