Ballot counting begins in military-run Guinea-Bissau after voting ended in a referendum that could expand the president's powers, ahead of a general election later this year aimed at restoring civilian rule.

Ballot counting began in military-run Guinea-Bissau as voting ended in Sunday's referendum, which could give the president more powers ahead of a general election meant to restore civilian rule later this year.

Security was stepped up at strategic points in the capital, with members of the national guard and the police stationed at key locations.

Voting booths closed as planned at 5:00 pm local time, with the first provisional results due on Tuesday.

Idrissa Djalo, executive secretary of the National Electoral Commission, told a press briefing Sunday evening that turnout had "exceeded" 55 percent.