The denial was made by NSPRT chief security guard Nasser Yima, referring to an incident which occurred at 9.10pm on Saturday.
It was earlier reported that five plaincloth soldiers on patrol on five motorcycle were shot at, possibly by NSPRT guards in Soi Likhit near the 1st Army headquarters and Wat Benjamabopit. Two soldiers - Chief Warrant Office Chaiyan Lekpong and L/Cpl Prasert Chansri - were hit and wounded. They were taken to Ramathibodi Hospital.
Lt Gen Apirat Kongsompong, the 1st Infantry Division commander, said a complaint had been filed with Dusit police, adding that the shots were possibly from NSPRT guards acting out of a misunderstanding.
Mr Nasser said it all began with an unknown type of grenade being fired on the Nang Lerng intersection. This was followed by a clash between the soldiers on patrol and an unidentified group of attackers, leaving two soldiers wounded.
On an account given to police by one of the soldiers that he saw an NSPRT guard pointing a revolver at the head of a wounded soldier, Mr Nasser said the NSPRT guards were not involved in the incident. He said the area was outside the NSPRT's responsibility.
The NSPRT had informed the police that it had nothing to do with the shooting, he said.
Pol Col Supakij Torboon, chief of the Dusit police, led a team of forensic police and military officers to examine the spot on Sunday.
He said it could not be confirmed whether it was NSPRT guards who opened fire at the soldiers because the area was dark and the shooters were not visible. Moreover, security cameras in that area were out of order.
Pol Col Supakij said he had reported an initial investigation result to Pol Gen Vorapong Chiewpreecha, a deputy police chief who is in charge of the case.
NSPRT protesters led by Nitithorn Lamlua and Uthai Yodmanee on Sunday conducted a merit making activity to mark Chakri Day in the courtyard of Government House but did not go inside the building. The activity ended at about 6pm.