Some 300 000 Afghan and international troops have been deployed to protect voters, but early on rocket attacks were reported in a number of cities. Photo by wikimedia.org
Millions of Afghans have begun voting in the country's second presidential election since the fall of the Taliban.
Militants have threatened to disrupt the polls, in which President Hamid Karzai is running for a second term.
Violence has escalated in recent days and there are fears some Afghans will be afraid to vote.
Some 300 000 Afghan and international troops have been deployed to protect voters, but early on rocket attacks were reported in a number of cities.
The small rocket attacks happened in cities in Helmand, Kandahar and Ghazni provinces and a small blast occurred in Kabul, BBC reporters say.
Ghazni police chief Khial Baz Sherza said one rocket had landed close to where about 30 people were waiting to vote, but said no one had been hurt.