A group of main opposition Republican Peoples’ Party (CHP) members have been attacked with blank firing rounds when they were hanging a ‘No’ banner on a building in Istanbul’s Beykoz district.

The firings came just minutes before a group of men, believed to be government supporters, drove by the CHP delegate to direct them a tirade of verbal attack.

The referendum, scheduled to take place on April 16, is set to introduce a shift from parliamentary power to the executive presidency and to give more power to President Recep Tayyip Erdoğan. The government has been carrying out an aggressive Yes campaign with several rallies held across the country and attended by high-profile figures including Erdoğan himself.

Meanwhile, opposition deputies are often prevented from appearing at state-run media outlets as much as government representatives.