Phnom Penh police have asked the opposition party to lodge an official complaint after an unknown gunman fired a single bullet through its party offices Saturday, saying they cannot fully investigate without such documents.

“We hope that the [Cambodia] National Rescue Party would join to give some light in this research.… I am waiting for their complaint in order to open this investigation clearly,” said Municipal Police chief Chuon Sovann, adding that an investigation commission is being established.

“If the National Rescue Party does not take part, our investigation has a little bit of difficulty,” Sovann said.

CNRP spokesman Yim Sovann called the claim baseless and an indication that a conclusion was hopeless.

“My god … this is a pretext,” he said. “We have complained to him to take measures there already.”

Deputy CNRP president Ho Vann said he would lodge an official police complaint today along with a court complaint “to demand 20 million riel [$5,000] for compensation”.