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.

Trump says US military strike killed leader of Venezuela's Tren de Aragua gang
US and Iran signal a peace deal is close
Qatar rejects media report on energy production decisions
Trump says Iran war deal close as Strait of Hormuz tensions linger
Victims' families mark Air India crash anniversary with prayers and tributes
Ebola outbreak spreads to crowded displacement camp in Congo
Fire breaks out at New Zealand's Wellington airport, disrupting flights
Ukraine and Russia trade overnight drone strikes, officials say
