Eyewitnesses said supporters of UP member candidate Omar Farooq Sajib opened fire when the supporters of another candidate blocked their way to get inside the centre of Charchandia Hossainiya government primary school at noon.
Later, the injured were sent to Sonagazi health complex. Titu Ranjan Das, presiding officer of the centre, said no untoward incident occurred inside it.
Additional superintendent of police Thoai Ampra Marma said the situation is under control now. Meanwhile, Sajedul Islam, acting officer-in-charge of Sonagazi model police station, said police detained 72 people on various allegations during the election.