The gunman wrote on his Facebook page earlier in the day that "Death is inevitable for everyone". Gunman, identified as junior army officer, had holed himself up in basement of shopping centre in Nakhon Ratchasima. It seems like he had an issue with his commanding officer, but there's no indication of why he attacked civilians in broad daylight. The suspect also posted a picture of what appeared to be his hand holding a gun. Al Jazeera's Thailand producer Kittiphum Sringammuang said police were working to establish the motive for the mass shooting. Several shootings at courthouses late last year also renewed concern about gun violence in the country.