The Department of Corrective Services has denied reports two more prison officers have been assaulted in recent days.
It follows a separate incident in which three officers were attacked while breaking up a fight involving notorious murderer Valerie Parashumti.
The WA Prison Officers Union has said two prison officers were assaulted at Hakea Prison over the past few days.
One officer was allegedly knocked over by a prisoner, causing suspected broken bones and serious muscle damage, while the other officer was allegedly punched in the head by a prisoner with a mental illness.
The department has dismissed the allegations.
“As far as we’re concerned, there’s been no incidences reported,” a spokesman said today.
It follows a confirmed attack last weekend in which three prison officers were attacked and punched in the head at Greenough Regional Prison, 420km north of Perth, while breaking up a fight between Parashumti and another prisoner.
Parashumti and her lesbian lover Jessica Stasinowsky were sentenced to a minimum 24 years’ jail in March 2008 for the murder of 16-year-old Stacey Mitchell.
Both pleaded guilty to bashing Stacey with a concrete block and strangling her with a dog chain because she annoyed them.
The pair kissed over her body before disposing of it in a wheelie bin, mimicking Stacey’s English accent and filming the blood stained crime scene on a mobile phone.
The incident at Greenough Prison comes amid a campaign by WA prison officers calling for a five per cent pay increase next year and highlighting the risks of the job.
The union also wants increased funding to the WA prisons system to deal with record numbers of prisoners, new facilities to address overcrowding, and an increase in staffing levels.
WA Prison Officers Union secretary John Welch said the attacks added pressure on the department to sit down with the union to discuss the ongoing concerns of prison officers.
“With 13 of 15 WA prisons currently overcrowded, it is no wonder that there is more tension within our prisons,” he said.
A spokeswoman for Corrective Services Minister John Cowper said the union had agreed in 2010 that the current enterprise bargaining agreement would remain in force until June 10, 2013 or until a replacement agreement was registered.
“There is an obligation for the negotiations to commence with a view to implement a replacement agreement six months prior to the expiry date. This would mean negotiations are due to commence in December 2012,” she said.
“Despite this agreement, the union has obviously decided to start their public media campaign early.”
The spokeswoman said the incident at Greenough Prison was under police investigation, so she could not comment further, other than to say that it had nothing to do with overcrowding.