Papua New Guinea's industrial registrar has issued a strong warning to the PNG Teachers Association that a strike which began on Monday is illegal.
The National Broadcasting Corporation reports the chairman of the Teaching Service Conciliation and Arbitration Tribunal, Pex Avosa, saying the union has no authority to allow its members to withdraw their labour.
In a letter to the union he says any decision to take industrial action needs the approval of two-thirds of the members and a secret ballot has to be conducted.
Teachers in the National Capital District and the Highlands have been on strike since Monday over unpaid salary adjustments and allowances as agreed to in an MOU signed two months ag o with the Teaching
Teachers in West Sepik province and other centres have now joined the strike.