PHUKET: The plot thickened in the ongoing investigation into encroachment onto Sirinath Marine National Park yesterday as five former park chiefs were accused of signing documents allowing encroachment.

“After reviewing several land titles from owners in the area, we discovered that five chiefs signed their names, making it legal for landowners to build on land that is part of Sirinath National Park,” said Samak Donnapee, Director of the Department of National Parks, Wildlife and Plant Conservation (DNP).

The five park chiefs accused – Thanapong Apaiso, Somkiet Soonthornpitakboon, Sukkhee Kamnuanslip, Jaruai Injan and Nontawit Jaturabanthid – worked at the park between 2005 and 2011, but are all now retired, Mr Samak said.