The sweeping arrests have even prompted country analysts who work in Turkey to be cautious, with several declining to give any comment to CNBC due to what one described as the very tense nature of the situation in the country.
The mass arrests in a post-coup crackdown have put pressure on the country's prisons and have led to reports of overcrowding although this was not mentioned as a reason for the relaxation of release conditions.
As of March – the latest available data and before the mass detentions following the coup – there were almost 188,000 people in Turkey's 355 prisons, according to the U.K.-based Institute for Criminal Policy Research, above the official prison capacity of around 180,000.
Ministry of Justice statistics show that the number of prisoners has risen during Erdogan and his conservative Justice and Development (AK) party's time in power; In 2002, when the AK party and Erdogan won their first election, the prison population was 59,429.
Erdogan believes the plot was carried out by followers of Fethullah Gulen, a popular Turkish cleric and former ally who now lives in the U.S. Gulen has denied any prior knowledge of the plot or involvement and has said that Erdogan has used the coup as an excuse for a crackdown on the opposition. The U.S. has so far refused Turkey's requests to extradite Gulen.
The U.K. expert who asked not to be named told CNBC that he now expected the crackdown "to continue in the next couple of weeks if not months" and feared that proper judicial processes might not be followed.
"These people are being treated as guilty before being proven innocent and the fact is that we have thousands of individuals being targeted that may or may not have a connection to the Gulen movement . The government is using this as an excuse to flush out dissent across the board."
William Jackson, senior Emerging Markets Economist at Capital Economics, told CNBC the announcement was likely to have a negative impact on Turkey's economy, with the continuing political crackdown deterring investors.
"I suspect it may reinforce concerns among investors that the backlash against supporters of the coup will continue, or perhaps become more aggressive. I think the concern here is that may be interpreted as a sign of more arbitrary policymaking and a shift towards a greater centralization of power (particularly in the presidency). Ultimately, that may weigh on investment and the economy's growth prospects."
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