A huge turnout in South Africa's general election has left officials struggling with angry queues at polling stations and too few ballot papers.

By mid-afternoon, fears were emerging that ballot papers were running out in places and some ballot boxes were full.

But election officials say anyone in line when polls close will get to vote.

The election is expected to be the most competitive since the end of apartheid in 1994. The ruling ANC - led by Jacob Zuma - is expected to win.

But it could lose its two-thirds majority in parliament which allows it to change the constitution.