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 touts $5,000 payout if Republicans win as Vance waits in wings
Search expands after Philippine ferry fire kills five and leaves dozens missing
Trump says Iran war to end after US midterm elections
US military says it struck vessel in Caribbean, killing 3
At least 14 killed in explosion at weapons depot in Syria
US hits five Iranian oil tankers after attack on Navy ships
UK gives air traffic provider a week to probe outage that halted flights
Serbia's President Vucic dissolves parliament, calls snap elections
