An injured man recevies treatment at a hospital after a blast in Kabul, Afghanistan September 17, 2019.

Afghan security forces arrive at the site of a blast in Kabul, Afghanistan September 17, 2019.

Afghan security forces inspect the site of a blast in Kabul, Afghanistan September 17, 2019.

People carry a victim after a blast near an election rally held by President Ashraf Ghani in Parwan province, north of Kabul, Afghanistan September 17, 2019. Reuters TV via REUTERS

Security personnel is seen at the site of a blast near an election rally by President Ashraf Ghani in Parwan province, north of Kabul, Afghanistan September 17, 2019. Reuters TV via REUTERS

Afghan security forces keep watch at the site of a blast in Kabul, Afghanistan September 17, 2019.

ATTENTION EDITORS - SENSITIVE MATERIAL. THIS IMAGE MAY OFFEND OR DISTURB Afghan security forces remove remains of the bodies from the site of a blast in Kabul, Afghanistan September 17, 2019. REUTERS/Omar Sobhani - RC1A9AF06E30

Afghan security forces remove the remains of bodies from the site of a blast in Kabul, Afghanistan September 17, 2019.

A member of Afghan security force keeps watch at the site of a blast in Kabul, Afghanistan September 17, 2019.

Hospital workers carry injured men at a hospital after a blast in Kabul, Afghanistan September 17, 2019.

Smoke rises from the site of of a blast near an election rally held by President Ashraf Ghani in Parwan province, north of Kabul, Afghanistan September 17, 2019. REUTERS/Stringer

Security personnel carry an injured woman after a blast near an election rally held by President Ashraf Ghani in Parwan province, north of Kabul, Afghanistan September 17, 2019. Reuters TV via REUTERS