
No one was injured in the incident, which happened at 4 am.
Guards of the People's Alliance for Democracy said grenades might be launched from the Education Ministry.
Some military police were deployed to check the scene immediately.
Earlier the day or at 2 am, five series of gunfire were heard on roads around the Government House. Each moment, about ten shots of firing were heard.
No one was injured either.
Police and guards of the People's Alliance for Democracy said the gunfire was heard from the Misakawan Intersection to the Wang Daeng Intersection.
Police found that a suspect detention truck was hit over a dozen of times. The truck's windshield as smashed by some of the bullets.
Police some of the shots were fired from a bunker made of tyres.
Captain Supradit Plengchawee, a military police, who inspected the scene at 2 am, said he received a phone call from a PAD guard, alerting about the gunfire.
Supradit said the PAD suspected that a group of assailants opened fire at the PAD guards on Phitsanulok Road from inside the Education Ministry.
Supradit said the military could not go inside the ministry to investigate because it was odd hour.
The Nation