Police said today that they were investigating after an unknown assailant shot into the Tuol Kork office of the opposition party, breaking a window early Saturday morning.

“We got the report from the representative of the CNRP this morning,” said National Police spokesman Kirth Chantharith. “We sent our police officers to investigate. The early report is that one bullet went through and broke the window glass. No one was injured.”

According to Chantharith, the incident took place at about 3am. A Cambodia National Rescue Party representative said the shot was fired into a room in which a guard was sleeping; the building is the former Human Rights Party headquarters and remains the office of deputy president Kem Sokha.

“We cannot say [whether it was politically motivated] because we don’t have any source yet," said Chantharith. "Let's have time. Until we have something more, we cannot say.”

Kem Monovithya, CNRP spokeswoman, confirmed Chantharith’s report and said the party was trying to figure out the next steps.

“We are still waiting to hear from the police first,” she said.

“I don’t think we will add any more security because if a group of people are determined to harm us, we don’t have access to that kind of protection.”

On Friday, opposition leader Sam Rainsy returned to Cambodia after a Royal pardon overturned more than a decade of prison sentences. Upwards of a hundred thousand people turned out for his arrival, at which he gave a fiery speech, promising to "rescue" the nation.