At least 20 people have been killed and 50 injured in a bomb attack in the Afghan capital Kabul.
The explosion was followed by a gun battle near the office of Vice Presidential candidate Amrullah Saleh, who was wounded in the incident.
Three attackers were killed and about 40 civilians were rescued by security forces.
No group has claimed responsibility for the attack.
The violence came on the first day of campaigning for the country's presidential election on September 28.

Man charged with 10 counts of attempted murder after knife attack on UK train
Tanzania's Hassan sworn into office after deadly election violence
Powerful 6.3 quake kills at least 20 in Afghanistan, hundreds injured
Turkey set to call for action on Gaza as soon as possible, source says
