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.

Saudi-led coalition intercepts drone over Eastern Region
Pakistan school roof collapse kills at least 32 children and a teacher
China-North Korea bridge opens 12 years after completion
DR Congo Ebola death toll passes 4,400 in record-breaking outbreak
Ukraine accuses SpaceX of crippling drone missions as ties with US worsen
