The bank’s security guard, Yeunyong Boonmoh, reportedly told Bang Khun Thian police that the gunman hopped over a teller window, grabbed the money and quickly fled.
There were no reports of any injury.
A preliminary investigation from CCTV footage showed a male suspect wearing a grey long-sleeves shirt and a face mask. He was seen fleeing the scene towards Ekachai Road (outbound), but the vehicle he used is still unknown.