Turkish voters have approved constitutional reforms that the government says will strengthen the Muslim nation's democracy and help its candidacy for the European Union.
Many reforms approved in the referendum were uncontroversial.
Changes to the way senior judges are selected have raised concern that the judiciary will lose its independence.
Among other measures in the reform package were steps to make the military more answerable to civilian courts and remove immunity from prosecution for the leaders of the 1980 coup.
The referendum on constitutional reform was seen as a victory for Turkey's ruling AK Party who has celebrated its chances of winning a third term of single-party rule at an election due within ten months.
Critics believe the AK government will push through legislation without fear of the Constitutional Court blocking its way, as it did in 2008 when it struck down moves to lift a ban on women in headscarves attending university.
Drawn from Islamist parties banned in the late 1990s, AK Party leaders liken their movement to Europe's conservative Christian Democrat parties.
The government has won over many Turks by spearheading a drive to join the European Union and overseeing reforms.
The High Election Board announced the official results, with the government scoring a 'yes' vote of 58% to 42% for the 'no' camp.
The turnout, among an electorate of just under 50m, was put at 77%.
